Mince meat filling:
Braise onions in butter add mince meat and the rest with little water and cook till done.
Take long casserole or two casseroles, put 2 tablespoons of sauce and spread it. On working table place a tortilla spread a spoon of sauce, then scoop two tablespoon of mince mixture and roll it like swissroll, place on the casserole. When all done in same manner, pour the rest of sauce on top and sprinkle genourously grated cheese.