A soffritto is any combination of slowly fried vegetables commonly used in Italian and Latin American cooking. The most basic recipe includes onions and olive oil, but tomatoes seem to be a common theme as well. Many Latin American soffrittos also include peppers, both sweet and spicy, as well as a variety of other seasonings. Italian versions are often made with celery and carrots in addition to onions. I had some carrots and a little ginger root in the fridge, so I thought, why not? It's a common enough flavor combination that always yields delicious results.
The trick to a proper soffritto is to cook the veggies in a little bit of oil at as low a heat as possible for a really long time on the stove top. Keller's recipe suggests five hours! The vegetables eventually give up their water in the the bath of slowly simmering oil, becoming more concentrated. After several hours, they caramelize and form a richly flavored paste. Keller suggests making a big batch of it and freezing it or keeping it in the fridge for use over the course of a week. The depth of flavor that it added to my risotto was remarkable. Read on for the recipe...