French Dip Sandwich with Au Poivre Sauce Recipe

Name: French Dip Sandwich with Au Poivre Sauce Recipe
Prep time: 30 min
Cook time: 45 min
Total time: 1 h 15 min
Cuisine: French
Ingredients: 8 ounces butter, plus more as needed; 1½ ounces black peppercorns, crushed; 1 cup whiskey, for flambé; salt and freshly ground black pepper; 2 quarts beef stock, homemade or store-bought; 4 ounces heavy cream; 1 baguette or other hero-like bread; butter, for spreading; 3 ounces shaved medium-rare filet, tri-tip or roast beef; caramelized onions; 2-3 slices Swiss cheese; Au Poivre Sauce (recipe above)