Ingredients
- 3 tbsp. olive oil
- 4 pounds yellow onions (about 5 large onions), thinly sliced
- Kosher salt
- 1 1/2 tsp. all-purpose flour
- 1/4 c. cognac or dry white wine
- 2 32-oz containers low-sodium beef broth
- 2 bay leaves
- 6 large sprigs thyme, plus more for sprinkling
- 1 tbsp. sherry vinegar
- 8 thin slices country bread
- 3 oz. Gruyère cheese, finely grated
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