Instructions

Combine the ground beef, Worcestershire, mustard, onion, salt and pepper in a large bowl.  Set aside. Combine the cheese and butter, and blend. Divide the hamburger mixture into 12 patties.  Place a spoonful of the cheese-butter mixture on 6 of the patties.  Place the remaining six patties on top of the cheese-butter mixture.  With your fingertips, pinch the edges together to seal in the filling. 

Place the filled hamburgers on an oiled grill over medium heat.  Cook for about 4 minutes on each side for rare, or 6 to 7 minutes for well done.  Serve with a sprinkling of snipped chives.

Makes 6 servings