Peel the potatoes, dice them, and boil in salted water for 15-20 minutes, or until tender.
While the potatoes are cooking, dice the onion and carrots. In a large skillet, melt a knob of butter and sauté the onion and carrots until softened.
Add the ground lamb and cook until browned, breaking it up with a spoon. Stir in the tomato paste and Worcestershire sauce.
Pour in the beef broth and stir in the green peas. Simmer over low heat for 10-15 minutes, or until the mixture has thickened slightly.
Once the potatoes are cooked, drain them and mash with butter and milk. Season with salt and pepper to taste.
Spoon the meat mixture into a baking dish and spread evenly. Top with the mashed potatoes, smoothing them out and creating patterns with a fork.
Bake in a preheated oven at 400°F (200°C) for 20-25 minutes, or until the top is golden brown.
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