Prime Rib French Dip Sandwich Recipe

Ingredients 1 1 3 lbs leftover prime rib thinly sliced 1 tbsp butter 1 white onion 1 4 cup beef stock salt and pepper to taste 4 hoagie rolls 8 slices havarti cheese leftover au jus or two cups beefs stock simmered with two tbsp flour horseradish sauce. Ingredients one baguette of french bread or sourdough sliced length wise 1 lb prime rib or roast beef thinly sliced 8 10 slices provolone cheese 32 oz 1 qt beef broth. 1 4 cup chopped roast fat drippings or butter oil 3 garlic cloves peeled grated 2 tablespoons white wine 2 tablespoons all purpose flour 3 cups beef broth low sodium 1 2 tablespoons worcestershire sauce to taste 1 sprig fresh rosemary 1 sprig fresh thyme 1 2 teaspoons.