Name: The Best French Onion Soup
Prep time: 30 min
Cook time: 120 min
Total time: 150 min
Yield: 8 servings
Ingredients: 8 tablespoons butter; 4 tablespoons canola oil; 6 pounds yellow onions (sliced 1/4 inch thick with the grain); 1/2 cup sherry wine; 1/2 cup red wine; 1/8 cup tomato paste; 1/4 cup garlic purée; 1 bouquet garni; 4 tablespoons concentrated beef base; 10 cups chicken stock; thyme leaves for garnish; 1 baguette (cut into 1 inch slices); 8 slices provolone cheese; 2 cups shredded gruyere cheese ((optional))