INGREDIENTS
6 tbsp
butter
4 larges
yellow onions
1 tbsp
white sugar
2 cloves
garlic
1/2 cup
sherry
7 cups
low sodium beef broth
1 tsp
sea salt
1/4 tsp
dried thyme
1
bay leaf
8 slices
french bread
1/2 cup
gruyere cheese
1/3 cup
emmental cheese
1/4 cup
parmesan cheese
2 tbsp
shredded mozzarella cheese