INGREDIENTS
6 tbsp
butter
4 larges
onions and into rings
1 tbsp
sugar
2 cloves
garlic
1/2 cup
cooking sherry
7 cups
beef broth
1 tsp
sea salt or
1/4 tsp
thyme
1
bay leaf
8 slices
bread
1/2 cup
gruyere cheese
1/3 cup
emmental cheese
1/4 cup
freshly parmesan cheese
2 tbsp
mozzarella cheese