Traditional British Cottage Pie

Brown ground beef in a large skillet with onions, carrots, and celery.

Add tomato paste, beef stock, thyme, and Worcestershire sauce; simmer for 20 minutes until the sauce has thickened.

Make mashed potatoes by boiling peeled potatoes and mashing with butter and milk.

Pour the beef filling into an ovenproof dish.

Spread the mashed potatoes over the top, using a fork to create a textured surface for crisping.

Bake at 200°C for 25-30 minutes until the potato top is golden and the edges are bubbling.

Serve hot.