Preheat oven to broil. Slice French bread in half lengthwise, but not all the way through, spread butter on both sides, broil until golden brown. Place a slice of cheese on one half of bread, broil additional 1 to 2 minutes.

Bring au jus to a boil in a saucepan over medium-high heat, reduce to a simmer.

To heat meat, dip beef in au jus (about 1 minute) and place on bread over cheese. Spread sour cream over the other side of French bread. Sprinkle with green onions, close and slice sandwich diagonally. Serve with a side of au jus for dipping, a dill pickle spear, potato salad, potato chips or fries.

HOMEMADE AU JUS: In a medium saucepan over medium-high heat, bring pan drippings, beef stock and red wine to a boil, season with salt and pepper, reduce heat and simmer. Makes about 3 cups

Cook's Note: Great with leftover roast beef.