Melt the margarine in a saucepan. Stir in enough flour to make it thick (but don`t let it get too dark). Stir in the milk with a whisk. Then season the sauce with fondor, salt and pepper. Add the vegetables to the sauce and let them steep until they are firm to the bite.
Then first put some of the sauce in the baking dish and cover it with lasagne sheets, then again sauce, lasagne sheets Finally, sprinkle with the cheese.
Bake in the preheated oven at 200 ° C top / bottom heat for about 30 minutes.