Hawaiian Roll Roast Beef and Cheese Sandwiches Recipe

Ingredients

• 0.5 cup prepared horseradish
• 1 (12 count) package Hawaiian bread rolls, split
• 12 slices deli roast beef
• 12 slices deli-sliced Swiss cheese
• 0.5 cup butter
• 1 onion, finely chopped
• 2 tablespoons brown sugar
• 1 tablespoon spicy brown mustard
• 1.5 teaspoons Worcestershire sauce
• 1 pinch garlic powder, or to taste
• 2 teaspoons poppy seeds