Steak Sandwiches with Homemade Au Jus - No Ordinary Homestead

Ingredients

• 2 tablespoons bacon grease
• 2 tablespoons butter
• 1 1/2 tablespoons all-purpose flour
• 2 cups beef broth
• salt and ground black pepper to taste
• 1 pound cooked steak (cut into thin strips)
• 1 tablespoon oil or butter
• 1 small onion (sliced)
• 1 green bell pepper (sliced)
• 4 slices provolone cheese
• 4 hoagie rolls