Soffritto is the heart of Italian cooking, a simple yet essential mixture of carrots, celery, and onions that forms the base for countless dishes, including rich tomato sauces, stews, and soups. This ...

Keller’s slow-cooked version of soffritto takes about five hours to prepare, so a cook would do well to make it a day or two ahead of time. 1. Wash the clams under cold running water; if they are very ...