Hot Party Sandwiches

2 cans crescent rolls 8 slices deli ham 8 slices deli roast beef 8 slices swiss cheese 2 T. butter 2 T. mustard 1 small onion, chopped
Saute onion in butter. Roll out 1 can crescent rolls on bottom of 13x9 pan, pressing seams together. Spread mustard on rolls. Spread onions on top. Layer ham, beef and cheese. Roll out second can of rolls,over top press seams together. Bake at 350 15 minutes or until golden brown. Cut into squares and serve hot or cold.