INGREDIENTS
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2 cups unbleached all-purpose flour
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1/4 teaspoon salt
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3/4 cup (1 1/2 sticks) cold unsalted butter, cut into small cubes
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2 tablespoons ice water
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1 pound onions
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3 tablespoons olive oil, divided
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2 tablespoons balsamic vinegar
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1 1/4 teaspoons salt, divided
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1/2 teaspoon freshly ground black pepper, divided
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2 tablespoons butter
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1 1/2 pounds mushrooms, sliced
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1 large egg
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3/4 cup ricotta cheese
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3/4 cup Parmesan cheese, divided
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1/4 cup heavy cream
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1/4 cup chopped chives or green onions