Ingredients

• 1 tablespoon oil
• 2 pounds onions, sliced
• 1/2 cup dry white wine or water
• 1/2 cup beef stock or water
• 1 clove garlic, chopped
• 1/2 teaspoon thyme, chopped
• 3/4 cup sour cream
• 1/2 cup mayonnaise
• 1 tablespoon lemon juice
• 1 teaspoon Worcestershire sauce
• 1/4 cup gruyere, grated
• salt, pepper and cayenne to taste

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