Step-by-Step Instructions

• Preheat the oven to 400°F (200°C).
• Boil the peeled and diced potatoes in a large pot until fork-tender.
• Mash the drained potatoes with butter and milk until smooth. Season with salt and pepper.
• In a large skillet, cook the ground lamb over medium heat until browned.
• Add the diced onion and minced garlic to the skillet and cook until translucent.
• Stir in tomato paste, beef stock, and Worcestershire sauce; simmer to meld flavors.
• Add frozen peas and carrots to the filling, then season with salt and pepper.
• Spread the meat mixture in a greased baking dish and top with the mashed potatoes.
• Bake for about 20 minutes until the top is golden brown.
• Let rest for 5 minutes before serving.