Juicy Lasagna

Sauté the onions and carrots, then add the ground meat and cook; dice the tomatoes, add them to the meat and simmer, season with salt, pepper, and spices.

For the sauce: melt the butter in a saucepan, add the flour and whisk vigorously for 4 minutes over low heat, gradually pour in the milk and stir until thickened, season with salt and pepper.

Grate the cheese.

Grease the bottom of the baking dish with sauce. I recommend dipping each pasta sheet in boiling water for 2-3 minutes and transferring it directly to the dish, spread the meat filling, top with sauce and cheese, and repeat for several layers until everything is used up. Cover with foil.