Soup/French Onion Gratinee

Ingredients

• 4 tbsp butter
• 1.50 lbs yellow and white onions
• 1 cup white wine
• 8 cup beef stock
• 1 tsp salt
• 2 tsp pepper
• 1 tbsp white flour
• 1 tbsp water
• 0.25 cup dry sherry
• 1 French bread
• 6 cup grated Gruyere cheese