Super simple and delicious comfort food, this Shepherd's Pie with lamb is perfect for a cozy weeknight dinner on a chilly night! You can also make it into Cottage Pie with ground dbeef.
Preheat your oven to 400°F (200°C). Set a large pot of salted water over medium-high heat and bring to a full boil.
Meanwhile, peel and dice the onion, dice the celery, peel and cut the carrots into coins, and mince the garlic. If using fresh green beans, trim the ends and cut the beans into ½ inch pieces.
Wash and peel the potatoes. Cut them into 2-inch cubes. Add the potatoes to the boiling water. Cook until the potatoes are fork tender, about 10 minutes. Meanwhile, cook the filling.
Meanwhile, heat an oven-safe skillet over medium-high heat. Brown the ground meat, breaking it apart as it cooks. Add the onion, carrot, celery, green beans, and garlic, and sauté for 2-3 minutes.
Stir in the beef stock, tomato paste, herbs, and salt. Continue cooking for another 2-3 minutes.
When potatoes are fork tender, remove from the heat and drain through a colander. Transfer potatoes to a large mixing bowl.
To the potatoes, add coconut cream, ghee, salt and pepper. Use a potato masher or electric mixer on medium speed to blend, just until smooth. (Avoid over mixing, which can result in pasty mashed potatoes. If needed, add more coconut milk to reach a creamy consistency.)
Spread the mashed potatoes evenly over the filling (I like to leave a little open space on the edges so it bubbles over a tiny bit. Those crispy pieces are my favorite!)
Bake casserole in the preheated oven for 15-18 minutes or until the potatoes begin to get crispy on top.
Remove from the oven and garnish with additional pepper and/or fresh thyme or parsley, if desired. Divide among four plates and serve while warm.
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Notes
For a low carb or keto cottage pie: Omit the carrots and mashed potatoes. Instead, top with cauliflower mashed potatoes. Sprinkle about 1/2 cup of shredded full fat cheddar cheese over the mash before baking.