INGREDIENTS
1 tbsp
oil
2 lb
onions, sliced
1/2 cup
dry white wine or water
1/2 cup
beef stock or water
1 clove
garlic, chopped
1/2 tsp
thyme, chopped
3/4 cup
sour cream
1/2 cup
mayonnaise
1 tbsp
lemon juice
1 tsp
Worcestershire sauce
1/4 cup
gruyere, grated
salt, pepper and cayenne