Traditional Cottage Pie

Instructions

1. Crank your oven to 400°F. You'll want that heat steady and ready when the assembled pie goes in.
2. Tumble the potato quarters into a large pot and cover generously with salted water. Bring to a vigorous boil and cook until they break apart easily when pierced with a fork — properly tender potatoes are the foundation of great cottage pie.

   ⏱ 15 min
3. While potatoes bubble away, heat a large skillet over medium-high heat and crumble in the ground beef. Break it apart with your spoon and let it brown properly — you want some good caramelization happening, not gray steamed meat.

   ⏱ 8 min
4. Toss the diced onion and carrots into the beef and stir everything together. Cook until the onion turns translucent and the carrots start to soften around the edges — this builds the flavor base for your filling.

   ⏱ 5 min
5. Push the tomato paste and flour into the mixture, stirring constantly so the flour doesn't clump. Let this cook for a full minute to eliminate any raw flour taste and deepen the tomato flavor.

   ⏱ 1 min
6. Pour in the beef broth, Worcestershire sauce, and thyme, scraping up any browned bits from the bottom of the pan. Keep it at a gentle simmer until the liquid thickens into a proper gravy that coats the beef nicely.

   ⏱ 5 min
7. Fold in the frozen peas and season generously with salt and pepper. The peas will thaw from the heat — no need to cook them further. Taste and adjust seasoning, then take the skillet off the heat.
8. Drain the potatoes thoroughly and mash them with the butter, warm milk, and a good pinch of salt until they're smooth and creamy. No lumps allowed here — they need to spread evenly over the filling.
9. Spoon the beef mixture into a 9x13 baking dish and spread it into an even layer. This is your savory foundation.
10. Dollop the mashed potatoes over the beef and use a fork or offset spatula to spread them from edge to edge. Cover every bit of filling — you don't want any spots to dry out during baking.
11. Paint the potato surface with the beaten egg yolk using a pastry brush. This gives you that beautiful golden finish that makes cottage pie so appealing.
12. Slide into the oven and bake until the potato topping turns a rich golden brown with slightly darker peaks. The filling should be bubbling around the edges when it's ready.

    ⏱ 25 min
13. Let the cottage pie rest on the counter before serving — this gives the filling time to set up so it doesn't run all over the plate when you cut into it.

    ⏱ 10 min