Tasty Hamburger

Directions

1. 1
   Place meat and onions in a heavy skillet and lightly brown. Add celery, salt, pepper and cheese.
2. 2
   Stir until cheese is melted. Cool in the refrigerator.
3. 3
   Butter one side of the bun and mustard on the other side.
4. 4
   Fill with the cooled mixture.
5. 5
   Wrap each in foil.
6. 6
   Heat in a 400° oven for 20 minutes or until hot.