All-purpose soffrito
From "Soffritto: Tradition and Innovation in Tuscan Cooking" by Benedetta Vitali. This is the base for countless Italian soups, stews and sauces.
1 red onion
1 carrot, peeled
1 rib celery
1/2c. extra-virgin olive oil
Directions
Mince the onion, carrot and celery as fine as you can (do not use a food processor, which can make the onion mushy). Heat the oil on medium in a heavy-bottomed pan. Add the minced vegetables and sauté, stirring frequently, until the vegetables are caramelized and lightly browned. Never leave the soffritto unattended (if you must answer the phone, ladle about1/3cup water into the pan, and stir until the water is evaporated.)