"With its biscuity buttermilk crust, this rustic pie is our new summertime staple. Let the pie cool for at least one hour before serving...."
INGREDIENTS
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2 cups all-purpose flour
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1 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon kosher salt
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6 tablespoons (3/4 stick) chilled unsalted butter, cut into 1/2" cubes
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3/4 cup buttermilk
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2 pounds large ripe tomatoes, cored and cut into 1/4" slices
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2 1/2 cups coarsely grated extra-sharp cheddar (8-9 ounces)
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1/4 cup finely grated Parmesan (1/2 ounce)
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1 scallion, trimmed, chopped
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1/2 cup mayonnaise
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2 tablespoons chopped fresh dill
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1 tablespoon apple cider vinegar
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2 teaspoons sugar
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3/4 teaspoon kosher salt
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1/2 teaspoon freshly ground black pepper
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1 1/2 tablespoons cornmeal