Preheat oven to 350 degrees F. Open the hoagie rolls and lay out on a baking sheet. Combine melted butter and 1/2 tsp garlic powder and brush on hoagie rolls.
Heat beef consomme, water and garlic powder in a medium saucepan over medium-high heat to make a rich beef broth. Place the roast beef in the broth and warm for 3 minutes. Arrange the meat on the hoagie rolls and top each roll with 2 slices of provolone.
Bake the sandwiches in the preheated oven for 5 minutes, or until the cheese just begins to melt. Serve the sandwiches with small bowls of the warm broth for dipping.
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