Fresh Tomato Tart

INGREDIENTS

• 1 1/4 cups flour
• 1 tablespoon plus 2 teaspoons cornstarch
• 1/4 teaspoon salt
• 6 tablespoons butter, diced
• 1 egg
• For the filling:
• 2 pints grape or cherry tomatoes, rinsed and dried
• ½ cup basil leaves, divided
• 1/3 cup chopped green onions
• 1½ cups sharp provolone, grated (or fontina)
• ½ cup mayonnaise
• ½ tsp. pepper