4 slices ham
2 tablespoons butter
2 tablespoons butter, melted
2 tablespoons prepared horseradish
1/4 cup finely chopped onion
1 cup sliced fresh mushrooms
1 small white onion, sliced into 1/2 inch rounds
1 dash Worcestershire sauce
Preheat the broiler.
Place the ham and butter on a cookie sheet. Season with horseradish, onion, mushrooms, and mushrooms. Drizzle with Worcestershire sauce and spread the ham mixture over the top. Broil 5 to 8 minutes per side, until mushrooms turn golden brown.