- Prep Time: 15 mins
- Cook Time: 15 mins
- Total Time: 30 mins
- Yield: 2 servings
Caramelized onions, Gruyère cheese, and a savory aioli make these French onion-inspired burgers rich and hearty.
Ingredient:
- 2 tablespoons unsalted butter
- 1 tablespoon extra-virgin olive oil
- 1 1/2 pounds yellow onions, thinly sliced (about 5 cups)
- 1 teaspoon fresh thyme leaves
- 2 teaspoons kosher salt, divided
- 1 1/2 teaspoons black pepper, divided
- 1/4 cup, plus 1 teaspoon dry sherry, divided
- 1 1/2 pounds 85/15 lean ground beef
- 4 (1-ounce) Gruyère cheese slices
- 1/2 cup mayonnaise
- 1 tablespoon Worcestershire sauce
- 1 teaspoon Dijon mustard
- 1 teaspoon soy sauce
- 4 sesame brioche hamburger buns, split and toasted
