INGREDIENTS
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Pie Crust:
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1 1/4 cups all-purpose flour
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2 1/2 teaspoons granulated sugar
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6 tablespoons cold butter, cut into 1/2-inch cubes
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2 tablespoons ice-cold water
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1/2 teaspoon vinegar
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Filling and topping:
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1 tablespoon butter
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1 large yellow onion, halved and cut into julienne with the grain
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2 teaspoons salt, divided
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3 1/2 pounds tomatoes, cut into 1/2-inch dice, divided
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1 teaspoon granulated sugar, divided
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1 teaspoon picked thyme
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2 tablespoons extra-virgin olive oil
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10 turns of the pepper mill or 1/2 teaspoon black pepper
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1/3 cup picked basil leaves
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1/2 cup mayonnaise
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1/3 cup grated Fontina
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1/3 cup grated Parmigiano-Reggiano