Cut up the onions in rings, caramelise the onions till they are brown and really soft in a large cast iron pan.
9 large Onions, 1 tbsp Butter
Add the white wine, brandy, thyme, garlic, salt, pepper and bay leaves. Leave to simmer for about 45 minutes.
3 cloves Garlic, 1 bottle White Wine, 2 tbsp Brandy, 1 tbsp Thyme, 1 tsp Salt, Pepper, 2 Bay Leave
Add the stock and leave to simmer for about an hour.
750 ml Beef Stock
Serve up in bowls, top the soup with the slices of baguette and gruyère cheese and put the bowls under a grill until the cheese is completely melted.
1 Baguette, 200 g Gruyère