01 -
Peel and finely chop the onions. Toss them into a pan with hot olive oil and let them soften. Add the ground beef and cook it through. Stir in the diced tomatoes, Herbs de Provence, salt, and pepper. Cover the pan and let it simmer for half an hour, stirring every so often.
02 -
Melt the butter in a pot. Stir in the flour and cook for about 2 minutes. Gradually whisk in the cold milk. Sprinkle in your salt, pepper, and freshly grated nutmeg. Keep stirring until the sauce thickens up.
03 -
Set your oven to preheat at 200°C. Grease your baking dish, then make layers starting with the pasta. Follow up with a layer of meat sauce, then béchamel, and a sprinkle of shredded Gruyère. Keep going for 3 to 4 layers, finishing off with a layer of Gruyère on top. Bake for 30 minutes.