Crockpot French Onion Soup

Crockpot French Onion Soup was pinched from <a href="http://www.howsweeteats.com/2011/09/crockpot-french-onion-soup/" target="_blank">www.howsweeteats.com.</a>
INGREDIENTS
makes a giant pot, about 8-10 servings
4 medium sweet onions, thinly sliced
3 garlic cloves, minced
4 tablespoons of butter
2 tablespoons balsamic vinegar
2 tablespoons brown sugar
3 tablespoons flour
8 ounces of beer
64 ounces of low-sodium beef stock
2 tablespoons fresh thyme
1/2 teaspoon black pepper
1/2 teaspoon salt
french bread
gruyere cheese, sliced
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