Easy, make-ahead, bite-sized sandwiches with Hawaiian rolls.
Step: 1
Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking dish.
Step: 2
Spread horseradish on the bottoms of the Hawaiian bread rolls and cover each with 1 slice roast beef and 1 slice Swiss cheese. Cover with top bread rolls.
Step: 3
Melt butter in a saucepan over medium heat. Cook and stir onion, brown sugar, spicy mustard, Worcestershire sauce, and garlic powder until onion is soft and translucent, about 5 minutes. Pour over Hawaiian rolls and sprinkle rolls with poppy seeds. Cover with aluminum foil.
Step: 4
Bake in the preheated oven until heated through, about 25 minutes. Uncover and bake until tops are lightly browned, about 10 minutes.
Per Serving: 445 calories; protein 24g; carbohydrates 47.7g; fat 12.8g; cholesterol 87mg; sodium 635.3mg.