INGREDIENTS
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2 3/4 cups plus 2 tablespoons all-purpose flour
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2 1/2 teaspoons salt
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2 1/2 teaspoons granulated sugar
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1 1/4 cups grated Gruyere cheese
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1 cup (2 sticks) plus 1 tablespoon unsalted butter, cold, cut into pieces
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1 large onion, diced
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3 cloves garlic, minced
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2 pounds assorted cherry tomatoes
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1/2 cup chopped basil
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Freshly ground black pepper
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1 large egg