Peel the potatoes, cut them into pieces, and boil them until tender in a pot of water with a pinch of salt.

Drain and mash the potatoes with the milk and butter into a purée. Season with a pinch of salt and pepper.

Preheat the oven to 400°F.

Finely chop the garlic.

Pour a splash of oil into a pan and cook the ground beef with a pinch of salt and pepper until done.

Add the garlic and cook for 1-2 minutes. Then add the leek to the pan and cook for a few more minutes until the leek has softened slightly.

Season the ground beef mixture further with paprika powder, curry powder, thyme, and a pinch of salt and pepper.

Spread the ground beef and leek mixture over the bottom of a baking dish.

Spoon the mashed potatoes over it and smooth the top. Sprinkle the grated cheese over the surface.

Place the baking dish in the oven for about 20 minutes, until the cheese is melted and lightly golden brown.

Let the casserole rest briefly and serve immediately.