Preheat oven to 350°.
Core and seed tomato halves. Sprinkle cut sides of tomato halves with 1/4 teaspoon salt. Place tomato halves, cut sides down, on paper towels. Let stand 20 minutes.
Place tomato halves, cut sides up, in a 13 x 9-inch baking dish coated with cooking spray. Sprinkle with 1/4 teaspoon salt, shallot, and next 5 ingredients (shallot through pepper). Drizzle with oil. Bake at 350° for 1 hour and 15 minutes or until tomatoes soften.