Mouthwatering Roast Leg of Lamb Recipe

St. Patrick’s Day is one of the most celebrated events in the Irish calendar. It offers a chance to revel in Irish culture, heritage and culinary delights. As a home chef who loves throwing parties, I am always on the lookout for exciting yet simple recipes to add to my St. Patrick’s Day feast. And what better way to show off my culinary prowess than with a succulent leg of lamb recipe?

In this recipe article, I will be sharing my all-time favorite St. Patrick’s Day Roast Leg of Lamb Recipe. A meal that will surely become a tradition in your household once you try it out. The roast leg of lamb is tender, juicy and packed with flavor that will leave your guests asking for seconds.

The recipe utilizes ingredients that are both easily accessible and affordable, making it an ideal dish to prepare for a large crowd.

Moreover, unlike other traditional meals that require an expert touch, this recipe is beginner-friendly and easy-to-follow. You don’t have to be an experienced chef to make this mouth-watering roast lamb – all you need is a little bit of patience, some basic cooking techniques and the willingness to experiment.

So, get ready to take your taste buds on a flavorful journey as we explore this St. Patrick’s Day Roast Leg of Lamb Recipe together!

Why You’ll Love This Recipe

St. Patrick's Day Roast Leg of Lamb
St. Patrick’s Day Roast Leg of Lamb

With St. Patrick’s Day around the corner, there’s no better time to try out a classic Irish dish – roast leg of lamb. And I guarantee you that you’ll fall in love with this recipe after just one bite.

First, let’s talk about why lamb is truly special. It has a deep, rich flavor and tender texture that makes it stand out from other meats. When roasted to perfection, it becomes succulent and juicy with a crispy exterior. Plus, it has high nutritional value – it’s packed full of protein, iron, and vitamin B12.

Now, let me tell you what sets this particular recipe apart. It’s been meticulously crafted to combine flavors that enhance the natural taste of the lamb. We start by coating the lamb with a mixture of Dijon mustard, garlic, parsley, salt, and pepper. This creates a bold flavor profile that perfectly complements the meat’s natural savoriness.

When slow-roasted in the oven with potatoes and garlic until the lamb is cooked through and the vegetables are golden brown and crispy outside yet creamy inside. The result? A delightful aroma wafts through your kitchen while all those rich flavors meld together to create an absolutely delicious meal that will make everyone feel like they’re being treated to something special.

And if that wasn’t enough to convince you, add some ballymaloe mint sauce on top of your serving for that extra layer of freshness or include peas and cherry tomatoes for splashes of color and nutrients on your plate.

So why will you love this recipe? Because it delivers on taste, texture and nutrition. Your guests won’t be able to resist seconds!

Ingredient List

 Sizzling hot from the oven, ready to be carved
Sizzling hot from the oven, ready to be carved

The key to a successful St. Patrick’s Day Roast Leg of Lamb is quality ingredients. Here’s what you need to make this dish:

Main Ingredients

  • 6-pound leg of lamb
  • 1 yellow onion, roughly chopped
  • 5 cloves of garlic, finely minced
  • 1/4 cup olive oil
  • 2 tablespoons Dijon mustard
  • 1/4 cup chopped fresh parsley
  • 2 tablespoons chopped fresh rosemary
  • Coarse salt and black pepper

For the Potatoes and Vegetables

  • 1 pound Yukon gold potatoes, peeled and cubed
  • 1 pound fresh peas, shelled
  • A handful of cherry tomatoes, halved
  • A splash of lemon juice and zest

For the Herb Mixture

  • 3 cloves of garlic, finely minced
  • 1/4 cup chopped fresh parsley
  • Salt, black pepper, and a pinch of paprika

Get your ingredients ready – it’s time to cook!

The Recipe How-To

 A beautiful spread for a festive St. Patrick's Day dinner
A beautiful spread for a festive St. Patrick’s Day dinner

Now that you have gathered all the ingredients and prepared them, let’s move on to the next step, which is roasting the lamb.

Step 1: Preheat Your Oven

Before roasting the lamb, always preheat your oven to 450°F.

Step 2: Prepare The Lamb

Coat your 6-pound leg of lamb with olive oil and season it generously with coarse salt and black pepper. This will give your lamb a nice crust on the outside.

Step 3: Make The Dijon Mustard Mixture

In a small bowl, mix together 2 tablespoons of Dijon mustard, 4 cloves of garlic, 1/4 cup of chopped parsley, and a pinch of salt and pepper. This mixture will be used to flavor the lamb.

Step 4: Spread The Dijon Mustard Mixture On The Lamb

Spread the Dijon mustard mixture all over the lamb, making sure it’s covered evenly. This will create a flavorful crust on the meat.

Step 5: Prepare The Potatoes

Boil two pounds of Yukon Gold potatoes until they are cooked through, then let them cool slightly before slicing them into rounds.

Step 6: Roast The Lamb And Potatoes Together

In a roasting pan, place the lamb in fat side up with several sprigs of rosemary and garlic around it. Add sliced potatoes around the lamb, drizzle everything with olive oil, lemon zest, and some more salt and pepper. Toss together to coat everything evenly.

Step 7: Roast In The Oven

Roast in preheated oven for about an hour or until internal temperature reaches 135°F (medium-rare). Remember to use a meat thermometer to check the temperature.

Step 8: Let It Rest

After removing from oven, tent loosely with foil and let it rest for at least 20 minutes before carving. This will allow the juices in the meat to redistribute throughout it for maximum flavor.

There you have it! A delicious St. Patrick’s Day Roast Leg of Lamb Recipe that is perfect for any festive occasion.

Substitutions and Variations

 Roast leg of lamb, the king of St. Patrick's Day cuisine
Roast leg of lamb, the king of St. Patrick’s Day cuisine

While the classic roast leg of lamb recipe basked in its St. Patrick’s Day glory is already a crowd-pleaser, there are many ingredient substitutions and variations to tailor this dish to your liking. Here are some ideas that can shake things up while preserving the essence of the recipe.

For a simpler version, you can try slow-cooked boneless leg of lamb; it requires less cooking time, and you can even use a slow cooker or an Instant Pot to do all the work for you. If lamb isn’t your choice of protein for this recipe, you can also use other cuts such as lamb shoulder, lamb chop or beef roast.

You can experiment with various herbs and spices to season the lamb depending on your preference. For instance, if you’re a rosemary devotee, swap out mint in the recipe for fresh rosemary sprigs and add some lemon zest for an extra zing. Additionally, changing up sides like switching peas to green beans or adding roasted carrots to serve alongside it provides endless possibilities.

Beer integration is another way to enrich this dish with some piquancy. Replace some of the broth with Irish stout while making the gravy, and let the beer’s malty notes bring out more depth.

Lastly, if you’re hoping to incorporate some greens into this dish, try adding cherry tomatoes and fresh spinach leaves for a burst of color and taste into your plate.

Serving and Pairing

 The perfect main course for a cozy dinner party
The perfect main course for a cozy dinner party

St. Patrick’s Day is a joyous celebration that deserves exceptional food and drinks. Pairing the roasted leg of lamb with delicate flavors can elevate your dining experience to new heights. The succulent roast has a rich, hearty flavor that provides a perfect base to layer various textures and subtle notes.

To complement the lamb’s meaty taste, serve it with roasted vegetables such as cherry tomatoes, peas, and buttered yukon gold potatoes coated with parsley salt pepper mixture for added aroma and flavor. You could also serve the lamb alongside salty feta cheese crumbles or a hard aged cheddar to add some tanginess and complexity.

As for beverages, consider pairing your lamb dish with a beer such as Guinness, which is synonymous with St. Patrick’s Day festivities. You can also opt for a full-bodied red wine like Cabernet Sauvignon or Syrah to match with the bold flavors of the Lamb.

To add an authentic Irish touch to your meal, try serving your roasted lamb with Ballymaloe mint sauce – an authentic Irish condiment made from fresh mint leaves, mustard powder, honey, red wine vinegar, salt, and pepper. The combination of mild menthol flavor paired with the juicy texture of this dish will tantalize your palate.

All in all, St. Patrick’s Day Roast Leg of Lamb Recipe gives you ample space to try out different ingredient combinations suitable for happier moments like family gatherings or even Easter dinner. Once you’re done preparing your mouth-watering recipe, sit back, relax and indulge in a lush ambiance created by good food and great company – Happy St. Patrick’s Day!

Make-Ahead, Storing and Reheating

 Succulent and juicy, it's sure to be a crowd-pleaser
Succulent and juicy, it’s sure to be a crowd-pleaser

Hosting a successful party requires meticulous planning, and part of that means preparing as much as possible ahead of time. Fortunately, this St. Patrick’s Day Roast Leg of Lamb Recipe lends itself well to being made in advance, stored, and reheated when ready to serve.

Once the roast leg of lamb has been cooked and allowed to rest for at least 10 minutes after coming out of the oven, you can store the meat in an airtight container in the fridge for up to four days. This is particularly handy if you’re planning your party a few days in advance since it allows you to prep the lamb earlier and frees up your day-of schedule.

To reheat the lamb, preheat your oven to 325°F (163°C), and place the leg in a roasting pan. If you want to add extra flavor, baste the lamb with melted butter, garlic, or lemon zest before reheating. Loosely cover the roast with foil and pop it in the oven for around 20 minutes per pound until it reaches an internal temperature of 140°F (60°C). At that point, remove the foil and continue cooking for another 15-20 minutes until it’s browned to perfection.

Another option for slow-cooked boneless leg of lamb is a slow cooker. Follow instructions indicated on your slow-cooker manual or aim for four hours on high or eight hours on low heat.

Thanks to its flavor profile and juicy texture, this slow-roasted Irish lamb recipe with yukon gold potatoes makes excellent leftovers. You can slice leftover meat thin and serve it cold atop arugula leaves with cherry tomatoes, fresh mint leaves or peas.

In case you still have additional pieces of cooked lamb remaining from your feast after storing them packed in single portions in freezer-safe bags. You should place them flat inside a resealable freezer bag that eliminates air before putting them inside the freezer where they can last up to six months.

Reheating frozen cooked lamb is very easy: Preheat your oven to 350°F (170°C) or use thaw mode on your microwave or put them back into high-pressure cooker at high pressure mode. Place frozen portions into an oven-safe dish with a few tablespoons of broth, tomato sauce or barbecue sauce so that they do not dry out during reheating process. Cover with foil and bake until heated through – about 20-30 minutes depending on portion size – taking into account that larger pieces may take longer due to their size.

With these tips and tricks up your sleeve for make-ahead, storing and reheating St. Patrick’s Day Roast Leg of Lamb Recipe , your party planning just got a whole lot easier!

Tips for Perfect Results

 A mouthwatering aroma that will have your guests drooling
A mouthwatering aroma that will have your guests drooling

Cooking a roast leg of lamb is quite simple with these easy-to-follow instructions, and the result is simply divine. However, to achieve the perfect results, keep a few tips in mind.

First, be sure to remove the leg of lamb from the fridge one hour before cooking to bring it to room temperature; this ensures even cooking throughout. Letting the meat come to room temperature also makes it easier for seasoning to penetrate the meat.

Next, when you’re ready to cook, preheat your oven at 450°F for at least 15 minutes before roasting. This will create an ideal environment for your leg of lamb to cook in.

When you’re cooking your lamb, remember that you don’t want to overcook it, as this will cause it to dry out. On the flip side, undercooked lamb is unpleasant and potentially unsafe to eat. To ensure that you get it just right, use a meat thermometer and take measurements frequently until it reaches your desired doneness.

Another tip is to let the roast rest for 15-20 minutes after cooking before carving. This resting time allows juices within the meat to redistribute evenly creating juicy and tender meat.

You can add in some roasted vegetables such as carrots or potatoes while roasting along with the leg of lamb. The vegetables absorb juices from the lamb making them flavorful too.

Finally, use only high-quality ingredients including fresh herbs like rosemary and mint from reputable sources to bring out the best flavor in your dish. You can also have a cold refreshing beer while cooking or serving your roasted leg of lamb for a true St.Patrick’s Day feel.

By following these tips, you’ll be able to serve an epic roast leg of lamb that will have everyone asking for seconds!


As we come to the end of our recipe article, you may still have some questions about cooking the perfect roast leg of lamb for St. Patrick’s Day. That’s where our FAQ section comes in, addressing some common queries that may arise during the preparation process. So, let’s dive into some of the most frequently asked questions on this recipe and ensure you have all the information you need to make a delicious meal that your guests will rave about.

Do you need to sear a leg of lamb before roasting?

When it comes to creating the ideal roast lamb, it’s essential to coat the meat with seasoning, then sear it in a pan before roasting. While some may believe searing helps retain moisture, the truth is that it enhances the flavor of the lamb.

Should leg of lamb be marinated before cooking?

According to the home chef, there is no need to marinate lamb as it is naturally tender. In fact, marinating lamb might make it harder to chew as the marinade can break down the meat’s integrity, including its texture and flavor. Typically, marinades are used to soften tough meat fibers, but in the case of lamb, it is unnecessary.

Which cooking method is ideal for a leg of lamb?

When it comes to lamb, the leg and rack cuts are the cream of the crop in terms of tenderness. To get the most out of these cuts, roasting is the cooking method of choice. Unlike braising or stewing, roasting involves cooking the meat with a dry heat, meaning no added liquids. However, if you’ve got tougher, less tender cuts like the shank or shoulder to work with, you’ll want to use the braising or stewing method instead.

Should leg of lamb be cooked fast or slow?

When it comes to cooking lamb leg, it’s essential to ensure that the meat is infused with flavor and retains moisture. It’s vital to note that lamb leg should only be cooked until it reaches a blushing pink and stays juicy. This is true for traditional Roast Lamb recipes, as well as slow-cooked dishes that take hours to reach the point where the meat falls apart.

Bottom Line

In conclusion, the St. Patrick’s Day Roast Leg of Lamb Recipe is a true masterpiece that will make you the star of any party. The succulent and tender meat, combined with the delicious flavors of garlic, rosemary, and ballymaloe mint sauce, will make your taste buds dance with joy. This recipe is also highly versatile – you can easily substitute or vary the ingredients to your liking.

What’s more, this recipe is relatively easy to prepare and can be made ahead of time to save you time and stress when hosting guests. And let’s not forget about the health benefits of lamb – it is a rich source of protein, iron, zinc, and vitamin B12.

So why settle for boring party food when you can impress your guests with this mouth-watering St. Patrick’s Day Roast Leg of Lamb Recipe? Give it a try and see for yourself how delicious it is!

St. Patrick's Day Roast Leg of Lamb

St. Patrick’s Day Roast Leg of Lamb Recipe

Roast leg of lamb with herb Dijon crust is an ideal choice for those who are planning a special celebratory at-home meal on St. Patrick’s Day March 17. Served with peas tossed with fresh mint, blistered cherry tomatoes, and Lyonnaise potatoes, this Irish-in-spired dish combined comfort food and flare.
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Cook Time 3 hrs
Course Main Course
Cuisine Irish
Calories 828.9 kcal


  • 3 -4 lbs leg of lamb
  • 1/4 cup Dijon mustard
  • 1/4 cup garlic, chopped
  • 1/4 cup parsley, chopped
  • 2 tablespoons black pepper
  • 2 tablespoons coarse salt
  • 2 large yukon gold potatoes
  • 1/4 cup yellow onion, diced
  • 1 tablespoon butter
  • 1/4 cup peas
  • 1 teaspoon of fresh mint, chopped
  • 12 cherry tomatoes


  • In a small bowl, mix Dijon, garlic, parsley, salt and pepper. Coat lamb evenly with this mixture. Roast in a 350F oven until an internal temperature is reached of 135°F.
  • Boil potatoes until cooked. Let cool, then slice into coins. Sauté potatoes and onions until golden brown. Add salt and pepper.
  • Melt butter add peas, mint, and tomatoes. Cook until heated through. Cut lamb into slices.
  • Serve with peas tossed with fresh mint, blistered cherry tomatoes and Lyonnaise potatoes.

Your Own Notes


Serving: 530gCalories: 828.9kcalCarbohydrates: 26gProtein: 67.3gFat: 49.6gSaturated Fat: 21.7gCholesterol: 235.6mgSodium: 3888.8mgFiber: 4.3gSugar: 3.6g
Keyword < 4 Hours, Lamb/Sheep, Meat, St. Patrick’s Day
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