Classic Shepherd's Pie with Irish Cheddar

Ingredients

• 4 large Yukon Gold Potatoes (peeled and cut into 1‑inch cubes)
• 6 tablespoons Unsalted Butter (divided: 4 Tbsp for potatoes, 2 Tbsp for filling)
• 1/2 cup Whole Milk (room temperature)
• 2 tablespoons Sour Cream (full‑fat)
• 1 large Egg Yolk (room temperature, helps set topping)
• 1/2 cup Irish Cheddar (white) (shredded)
• 0.5 pound Ground Lamb (lean)
• 0.5 pound Ground Beef (80% lean)
• 2 medium Carrots (peeled and diced)
• 1 large Yellow Onion (diced)
• 1 tablespoon Olive Oil (for sautéing)
• 2 tablespoons All‑Purpose Flour (for thickening)
• 1 tablespoon Worcestershire Sauce (adds depth)
• 1 tablespoon Tomato Paste (concentrated flavor)
• 1 cup Beef Stock (low‑sodium)
• 1/2 cup Frozen Green Peas (thawed)
• 1 teaspoon Fresh Rosemary (finely chopped)
• 1 teaspoon Fresh Thyme (finely chopped)
• to taste Salt
• to taste Black Pepper

Instructions

1. Boil Potatoes

   Place peeled and cubed Yukon Gold potatoes in a large pot of salted water. Bring to a boil, then reduce to a simmer and cook until fork‑tender, about 15 minutes.

   Time: PT15M

2. Mash Potatoes

   Drain potatoes in a colander, return to the hot pot, and add 4 Tbsp butter, milk, salt, pepper, sour cream, egg yolk, and shredded Irish cheddar. Mash until smooth and creamy.

   Time: PT5M

3. Sauté Vegetables

   Heat 2 Tbsp butter and 1 Tbsp olive oil in a large skillet over medium heat. Add diced carrots and onions; sauté until carrots are just tender and onions are translucent, about 5 minutes.

   Time: PT5M

   Temperature: medium heat

4. Brown the Meat

   Add ground lamb and ground beef to the skillet. Cook, breaking up with a spoon, until browned and no longer pink, about 5 minutes.

   Time: PT5M

   Temperature: medium‑high heat

5. Thicken the Filling

   Sprinkle 2 Tbsp flour over the meat mixture and stir for 1 minute to cook the flour.

   Time: PT1M

   Temperature: medium heat

6. Add Liquids and Simmer

   Stir in Worcestershire sauce, tomato paste, and 1 cup beef stock. Bring to a gentle simmer and cook until the sauce thickens, about 5 minutes.

   Time: PT5M

   Temperature: medium heat

7. Finish the Filling

   Add thawed peas, chopped rosemary, and thyme. Season with additional salt and pepper to taste. Simmer for 2 more minutes.

   Time: PT2M

   Temperature: medium heat

8. Assemble the Pie

   Lightly spray the edges of the casserole dish. Spoon the meat filling into the dish, spreading evenly. Dollop the mashed potato on top and use a fork to create peaks for browning.

   Time: PT5M

9. Bake

   Preheat the oven to 375°F. Place the assembled pie on the middle rack and bake until the top is golden brown and the filling is bubbling, about 25 minutes.

   Time: PT25M

   Temperature: 375°F

Nutrition Facts

Calories

450

Protein

25 g

Carbohydrates

45 g

Fat

20 g

Fiber

5 g

Ingredient Substitutions

• Instead of Yukon Gold Potatoes: Russet potatoes
• Instead of Unsalted Butter: Margarine
• Instead of Whole Milk: Half‑and‑half, plant‑based milk
• Instead of Sour Cream: Greek yogurt
• Instead of Egg Yolk: extra egg white
• Instead of Irish Cheddar (white): Sharp cheddar, Gruyère
• Instead of Ground Lamb: Ground turkey
• Instead of Ground Beef: Ground pork
• Instead of Carrots: Parsnips
• Instead of Yellow Onion: White onion
• Instead of Olive Oil: vegetable oil
• Instead of All‑Purpose Flour: Gluten‑free flour blend
• Instead of Worcestershire Sauce: soy sauce
• Instead of Tomato Paste: ketchup (reduced)
• Instead of Beef Stock: Chicken stock, vegetable broth
• Instead of Frozen Green Peas: fresh peas
• Instead of Fresh Rosemary: dried rosemary (1/3 tsp)
• Instead of Fresh Thyme: dried thyme (1/3 tsp)

Equipment Needed

• Large Pot
• Colander
• Potato Masher or Ricer
• Large Skillet or Cast‑Iron Skillet
• 9‑inch x 13‑inch Casserole Dish
• Oven
• Measuring Cups and Spoons
• Mixing Bowl
• Spray Oil (or butter for greasing) (optional)
• Spatula or Wooden Spoon

Critical Steps — Do Not Skip

• Boil potatoes until fork‑tender
• Incorporate egg yolk into mashed potatoes for stability
• Cook flour before adding stock to avoid a raw flour taste
• Bake until the potato peaks are golden and the filling is bubbling

Chef Tips from the Video

• For extra buttery flavor, use a mix of butter and cream instead of milk.
• A pinch of nutmeg in the mashed potatoes adds a subtle warmth.
• Use a cast‑iron skillet for the filling to develop deeper caramelization before transferring to the casserole dish.

Troubleshooting

Storage

Refrigerator: Cool to room temperature, then cover and refrigerate for up to 4 days.

Freezer: Wrap tightly with foil and freeze for up to 2 months. Thaw overnight before reheating.

Room temperature: Do not store at room temperature for more than 2 hours.

Make-Ahead Tips

• Prepare the mashed potato topping up to 2 hours ahead and keep covered in the refrigerator.
• Cook the meat filling a day before; reheat gently before assembling.
• Assemble the pie, cover tightly, and refrigerate; bake directly from the fridge, adding 5‑10 minutes to baking time.

Frequently Asked Questions