Mexican Lasagna

2 lb. hamburger
1 chopped onion
¼ c. taco seasoning
1 jar salsa
1 stick butter, melted
8 oz. sour cream
2 T. flour
8 large flour tortillas
8 oz. shredded cheese

Brown hamburger and onion and drain fat.  Add taco seasoning and jar of salsa.  Place 4 large tortillas on bottom of greased 9x13 pan.  Put half of meat on top of tortillas.  Make a paste with butter, sour cream, and flour and spoon half on top of meat.  Add half of the cheese.  Put on second layer of the same.  Bake for 30 minutes at 350° or microwave until hot.