Let’s settle this once and for all: Shepherd’s Pie is made with lamb. Cottage Pie is made with beef. The name “Shepherd” literally refers to someone who herds sheep. That said, most Americans grew up calling their beef version Shepherd’s Pie, and we’re not here to gatekeep comfort food.
This recipe gives you both options — a rich, savory filling of ground lamb OR beef, simmered with carrots, peas, and a silky gravy, then capped with a blanket of buttery, golden-crusted mashed potatoes. It’s humble, hearty, and the ultimate way to use leftover mashed potatoes. Perfect for St. Patrick’s Day, Sunday supper, or any night you need a hug in casserole form.
Instructions
Make the Mashed Potatoes
Place potatoes in a large pot and cover with cold water by 2 inches. Add 1 teaspoon salt. Bring to a boil, then reduce to a simmer and cook for 15–20 minutes until fork-tender.
Drain well, then return the potatoes to the hot pot (off heat) for 1 minute to steam off excess moisture. Mash or rice the potatoes until smooth. Stir in melted butter, egg yolks, pepper, nutmeg, and a pinch of salt. Do not add milk or cream — the mixture should be thick and spreadable. Set aside.
Preheat & Prep
Preheat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish (or a 10-inch cast iron skillet if oven-safe).
Cook the Aromatics
In a large skillet or Dutch oven over medium-high heat, warm the olive oil or butter. Add the onion, carrots, and celery (this trio is called a mirepoix). Cook for 6–8 minutes until softened and lightly golden. Add the garlic and cook for 1 more minute.
Brown the Meat
Add the ground lamb (or beef). Break it up with a spoon and cook until no longer pink and starting to brown, about 6–8 minutes. Do not drain the fat — it’s flavor (though if using fatty beef, you can spoon off a little).
Build the Gravy
Stir in the tomato paste and cook for 2 minutes until it darkens and becomes fragrant. Sprinkle the flour over the meat and stir constantly for 1 minute to cook out the raw flour taste. Gradually pour in the broth while stirring, scraping up any browned bits from the bottom.
Add Worcestershire, rosemary, and thyme. Bring to a simmer and cook for 8–10 minutes until the gravy is thick enough to mound on a spoon (it should not be soupy). Stir in the frozen peas. Taste and add salt and pepper generously — the filling should be very flavorful before baking.
Assemble the Pie
Pour the meat filling into the prepared baking dish and spread evenly. Spoon the mashed potatoes over the top in large dollops, then spread gently to the edges, sealing the filling completely. Use a fork to create decorative ridges and swirls on the surface — these will become crispy, golden peaks in the oven.
Bake
Place the dish on a baking sheet (to catch any bubbling overflow). Bake for 20–25 minutes until the filling is bubbly around the edges and the potato topping is golden brown with some darker spots. For extra browning, switch to broil for the final 2 minutes — watch carefully so it doesn’t burn.
Rest & Serve
Let the shepherd’s pie rest for 10 minutes before serving. This allows the filling to set so slices hold their shape. Serve with crusty bread or a simple green salad.
This Shepherd’s Pie is the definition of honest, soul-warming food.
