Ingredients
- 3 tablespoons olive oil, divided
- 2 large sweet onions, thinly sliced lengthwise (about 5 1/2 cups)
- 6 teaspoons kosher salt, divided
- 1/4 cup dry sherry
- 1 1/2 pounds Yukon Gold potatoes (about 4 medium), peeled and sliced crosswise into 1/4-inch-thick rounds (about 2 cups)
- 4 tablespoons unsalted butter, divided
- 1/2 teaspoon black pepper
- 4 ounces Gruyère cheese, shredded (about 1 cup)
- 1 teaspoon fresh thyme leaves
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