Bring a saucepan of water to a boil, and blanch the tomatoes in it for 30 seconds. Then plunge them into cold water to stop the cooking. Peel, halve, and seed the tomatoes. Cut each half in half. Set them aside.
Melt the butter in a medium-size saucepan, and add the celery, onion, and garlic. Cover, and cook over low heat for about 5 minutes. Then stir in the t