Chop the onion and garlic, fry lightly in a little butter. Add meat and fry until crumbly. Add the mushrooms and D tomatoes, season with salt and pepper, possibly a little vegetable stock and oregano. Cook for a good 30 minutes on a low flame.

Melt the butter, add flour and milk spoon by spoon and cook over a low flame, stirring constantly. The sauce shouldn't be too thick.

Grease the baking dish. Now bechamel, then pasta, then bechamel again, then minced meat sauce, cheese over it and repeat this up to 4 times. Finally, pour plenty of cheese over the top. Bake the oven to 180 degrees and bake for about 3/4 hours.