2 Tbsp olive oil, plus more to brush toasts
2 Tbsp unsalted butter
3 lbs yellow onions, about 6 large onions, halved, peeled and thinly sliced with the grain
1/2 tsp granulated sugar
2 garlic cloves, minced
1/2 cup dry sherry wine, or use dry vermouth or dry white wine
8 cups beef stock, or broth
1 bay leaf
3 sprigs fresh thyme, plus more to garnish (or 1/4 tsp dried thyme)
1 1/2 tsp salt, or to taste, divided
1/2 tsp black pepper, or to taste
12 slices baguette
8 oz gruyere cheese, 1 1/2 cups shredded, divided
Instructions
How to Make French Onion Soup:
Cut onions in half, cut off the ends, then peel and slice onions thinly (cut parallel with the grain of the onion).
In a large heavy-bottomed pot or dutch oven over medium heat, add 2 Tbsp olive oil and 2 Tbsp butter. Add sliced onions and sauté uncovered, stirring occasionally for 10 minutes.
Sprinkle the onions with 1/2 tsp sugar which will help the onions caramelize faster. Sauté uncovered for another 30-40 minutes, stirring occasionally until onions are caramelized and browned. Stir more frequently towards the end to prevent scorching or burning the onions.
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