INGREDIENTS
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For the pastry
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1 1/2 cups all-purpose flour, plus more for rolling out pastry
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1/2 cup unsalted butter, cold and cut into cubes
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1/2 teaspoon salt
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1/2 cup freshly grated Parmesan cheese
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Zest of 1/2 lemon
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1/4 cup ice water
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For the filling
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4 ounces/1 cup gruyere cheese, grated
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12 ounces ripe tomatoes, sliced
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1 teaspoon fresh basil, finely chopped
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1 teaspoon fresh rosemary, finely chopped
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1/4 teaspoon freshly ground black pepper
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1 tablespoon olive oil
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1 egg, beaten with 1 teaspoon water