Rustic Onion Tart
Ingredients
- 1 1/4 cup ( 160 g ) all-purpose flour
- 1 teaspoon kosher salt
- 5 ounces unsalted butter (1 1/4 sticks, 10 tablespoons, 137g), cubed
- 1/4 cup sour cream
- 3 medium red and/or yellow onions (enough for 5 to 8 cups, sliced)
- 2 tablespoons extra virgin olive oil
- 1 tablespoon unsalted butter
- Kosher salt
- 1 teaspoon balsamic vinegar
- 3/4 cup (not packed) roughly grated Gruyère cheese
- 1/2 teaspoon fresh thyme, chopped, or 1/4 teaspoon dried thyme
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