Dinner / Casseroles & pot pies
Shepherd's Pie with Lamb and Mashed Potato Crust
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Rich lamb gravy with carrots and peas under a blanket of mashed potatoes, forked into ridges that brown and crisp in the oven. On a cold night, the first spoon through the crust is the moment everyone waits for.
The short version
Cook onion, carrot and celery, brown the lamb, stir in tomato paste, flour and broth until thick, add peas, top with mashed potatoes, and bake at 400°F until browned, about 30 minutes. Use beef and it's cottage pie.
What makes ours better
why ours wins the argument at dinner
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Brown the lamb hard. Let the meat sit in the pan without stirring for a minute at a time. The browned bits become the savory backbone of the gravy.
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Tomato paste, Worcestershire and thyme. These give the filling depth without a long simmer, so it tastes like it cooked all afternoon.
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Add an egg yolk to the potatoes and fork the top. The yolk makes the topping richer and helps it brown. Ridges from a fork catch the heat and turn crisp.
What you need
the stars of the show
- Yukon Gold potatoes2 pounds
- Unsalted butter4 tablespoons
- Carrots2 medium
- Celery2 rib
- Ground lamb1¼ pounds
- Tomato paste2 tablespoons
- Fresh thyme leaves1 teaspoon
- Frozen peas1 cup
Mashed potato topping
Filling
read it twice. buy it once.
Steps
apron on. phone down. mostly.
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Boil the potatoes
Put the potatoes in a pot, cover with cold salted water by an inch, and bring to a boil. Simmer until a knife slides in with no resistance, 15 to 20 minutes. Heat the oven to 400°F with a rack in the middle.
About 18 min. Cook mode has a timer for this step.
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Cook the vegetables
While the potatoes cook, heat the oil in a large oven-safe skillet or Dutch oven over medium heat. Cook the onion, carrots and celery, stirring now and then, until softened but not browned, about 10 minutes.
About 10 min. Cook mode has a timer for this step.
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Brown the lamb
Raise the heat to medium-high. Add the lamb, salt and pepper, and break it into small pieces. Cook until no pink remains and the bottom of the pan is browned, about 8 minutes. Spoon off most of the fat.
About 8 min. Cook mode has a timer for this step.
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Make the gravy
Stir in the tomato paste and flour and cook for 1 minute. Add the broth, Worcestershire and thyme, scraping up the bottom. Simmer until thick enough that a spoon leaves a trail, about 5 minutes. Stir in the peas and taste for salt.
About 5 min. Cook mode has a timer for this step.
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Mash the potatoes
Drain the potatoes and return them to the hot pot for 1 minute to dry out. Mash with the butter, then stir in the warm milk, egg yolk and salt until smooth.
Don't use a food processor. It turns potatoes gluey.
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Top the filling
If your filling isn't in an oven-safe dish, scrape it into a 2-quart baking dish. Spoon the potatoes on top and spread to the edges so they seal in the filling. Drag a fork across the surface to make ridges and dot with the butter.
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Bake until browned
Set the dish on a sheet pan to catch drips. Bake for 30 to 35 minutes, until the filling bubbles at the edges and the peaks are golden brown. Rest for 10 minutes before serving so it holds together on the plate.
For extra browning, broil for the last 2 minutes, and watch closely.
About 30 min. Cook mode has a timer for this step.
Good to know
the stuff I’d tell you over the phone
- Shepherd's pie is made with lamb. With beef, it's cottage pie; the method is identical. Cook ground beef to 160°F.
- Russets give a fluffier mash, Yukon Golds a creamier one. Either works; don't leave the potatoes wet.
- To make ahead, assemble and refrigerate up to 24 hours. Bake 10 to 15 minutes longer, until hot in the middle.
- Storage. Fridge, 4 days. Freezer, up to 3 months, wrapped well. Reheat covered at 350°F until hot in the middle, then uncover to re-crisp the top.
Questions, answered
asked and answered at the kitchen counter
What is the difference between shepherd's pie and cottage pie?
Shepherd's pie uses lamb, cottage pie uses beef. The rest is the same, so swap freely.
Can I use leftover mashed potatoes?
Yes, about 4 cups. Warm them with a splash of milk so they spread easily, and stir in the egg yolk.
Why is my shepherd's pie watery?
The filling didn't simmer long enough or the vegetables were wet. Cook the gravy until it's thick enough to leave a trail when you drag a spoon through it.
Can I make shepherd's pie ahead of time?
Yes. Assemble it, cover, and refrigerate up to a day. Add 10 to 15 minutes to the bake.
Can I freeze shepherd's pie?
Yes, baked or unbaked, wrapped well for up to 3 months. Thaw overnight in the fridge before baking.
From the table
Made it? Tell me how it went, and who went back for seconds when they thought nobody was looking.
Made it?
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Published October 28, 2026.