Preparation

• In a high walled saute pan over medium heat, add butter. Once melted add onions and let saute for about 3 minutes. Then add seasonings, Worcestershire and one cup of broth. Let come just to a bubble while stirring often.
• Preheat oven to 425°F.
• Reduce heat of au jus to low and let continue to simmer. Stir occasionally.
• Cut each roll in half and place the bottoms on a parchment paper covered baking sheet. Pile 2-3 slices of roast beef on to each (should fold up so there isn't too much overhang). Place a half slice of cheese on top of each.
• Once oven is hot, place baking sheet in for 8-10 minutes. You want the cheese just melted.
• When you remove the sheet, immediately place the top buns on each. Cut each sandwich in half.
• Spoon au jus into ramekins and serve right away.