Tomato, Cheddar, and Bacon Pie

INGREDIENTS

• 2 1/4 cups self-rising soft-wheat flour (such as White Lily)
• 1 cup cold butter, cut up
• 8 cooked bacon slices, chopped
• 3/4 cup sour cream
• 2 3/4 pounds assorted large tomatoes, divided
• 2 teaspoons kosher salt, divided
• 1 1/2 cups (6 oz.) freshly shredded extra-sharp Cheddar cheese
• 1/2 cup freshly shredded Parmigiano-Reggiano cheese
• 1/2 cup mayonnaise
• 1 large egg, lightly beaten
• 2 tablespoons fresh dill sprigs
• 1 tablespoon chopped fresh chives
• 1 tablespoon chopped fresh flat-leaf parsley
• 1 tablespoon apple cider vinegar
• 1 green onion, thinly sliced
• 2 teaspoons sugar
• 1/4 teaspoon freshly ground black pepper
• 1 1/2 tablespoons plain yellow cornmeal