Tomato and Cheddar Pie Recipe

Ingredients

• 2 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 6 tablespoons (3/4 stick) chilled unsalted butter, cut into 1/2" cubes
• 1 cup buttermilk
• 2 pounds large ripe tomatoes, cored and cut into 1/4" slices
• 2 1/2 cups coarsely grated extra-sharp cheddar (8-9 ounces)
• 1/4 cup finely grated Parmesan (1/2 ounce)
• 1 scallion, trimmed, chopped
• 1/2 cup mayonnaise
• 2 tablespoons chopped fresh dill
• 1 tablespoon apple cider vinegar
• 2 teaspoons sugar
• 3/4 teaspoon kosher salt
• 1/2 teaspoons freshly ground black pepper
• 1 1/2 tablespoons cornmeal
• Use a 9"-diameter glass or ceramic pie dish