1. Prepare the Mashed Potatoes:
- Boil the potatoes in salted water until tender, about 20 minutes.
- Drain and return to the pot. Add milk and butter, then mash until smooth and creamy. Season with salt and pepper. Set aside.
2. Make the Meat Filling:
- Heat olive oil in a large skillet over medium heat. Add the onion and garlic, and sauté until the onions are translucent.
- Add the ground lamb (or beef) and cook until browned, breaking it up with a spoon as it cooks.
- Stir in the carrots and cook for a few more minutes.
- Add the frozen peas, tomato paste, Worcestershire sauce, broth, and thyme. Season with salt and pepper. Simmer the mixture until it is thickened, about 10 minutes.
3. Assemble the Pie:
- Preheat your oven to 400°F (200°C).
- Transfer the meat filling to the baking dish, spreading it out into an even layer.
- Spoon the mashed potatoes over the meat. Use a fork to create ridges on top, which will become crispy when baked.
- Sprinkle grated cheese on top if using.
4. Bake the Shepherd’s Pie:
- Bake in the preheated oven for about 20 minutes, or until the mashed potatoes are golden and the edges are bubbling.
- If desired, broil for the last few minutes to get a more golden top.
5. Serve:
- Let the Shepherd’s Pie cool slightly before serving to allow it to set, making it easier to serve.
Tips for Perfect Shepherd’s Pie:
- Richness: For a richer filling, you can add a splash of red wine to the meat mixture and let it reduce.
- Herbs: Fresh herbs like rosemary or parsley can be added to the meat filling for extra flavor.
- Vegetables: Feel free to add more vegetables like mushrooms or bell peppers to the filling.
Shepherd’s Pie is a wonderful dish that can be prepared ahead of time, making it perfect for busy days or for entertaining. Enjoy your delicious and comforting homemade Shepherd’s Pie!