The Kitchn: Onion and Mushroom Tart
By Sara Kate Gillingham
on
2 tablespoons ice water
For the filling:
1 pound onions
3 tablespoons olive oil, divided
2 tablespoons balsamic vinegar
1 1/4 teaspoons salt, divided
1/2 teaspoon freshly ground black pepper, divided
2 tablespoons butter
1 1/2 pounds mushrooms, sliced
1 large egg
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