How to cook
In another pot melt the butter and gradually add the flour while stirring constantly. When the butter and flour made incorporated and the flour is cooked, pour the milk gradually and keep stirring until the bechamel gets the desired consistency.
When the bechamel is ready add a small quantity of the filling to it and mix well. Spread some filling on the bottom of a baking tray, place a sheet of lasagna on top and add some filling again.
Keep adding filling and lasagna sheets. The last layer should be lasagna sheet and bechamel on top. Grade the yellow cheese and bake your vegetarian lasagna in a preheated oven to 392°F (200 degrees).