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Preheat oven to 375°F (190°C).
Heat olive oil in a large pan over medium heat. Add diced onion and garlic; sauté until softened.
Add ground lamb (or beef), cook until browned, breaking up the meat with a spoon.
Stir in tomato paste, frozen carrots, peas, and corn. Season with salt and pepper. Cook for 5 minutes until vegetables are heated through.
Meanwhile, boil potatoes in salted water until tender (about 15 minutes). Drain well.
Mash potatoes with butter and milk until smooth. Season with salt and pepper.
Spread the meat and vegetable mixture evenly in a baking dish. Top with mashed potatoes, spreading evenly.
Bake for 20-25 minutes, until the top is golden and crispy.
Let rest for a few minutes before serving.
Serving and Storage Tips
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