French Onion Soup Gratinée | Tante Marie's Kitchen

Ingredients

• 4 oz. (1/4 lb./8 Tbs.) butter
• 4 yellow onions, thinly sliced
• 1 clove garlic, finely minced
• 2 Tbs. flour
• 1 cup dry white wine
• 2 quarts beef stock
• 1 tsp. salt
• 1/2 tsp. black pepper
• 1/4 cup dry sherry