How to sweat vegetables
"Sweating" vegetables is a useful cooking technique that yields great results. To sweat vegetables place chopped vegetables in a sauté pan with a little butter or fat and simmer lightly. If the vegetables begin to release moisture—this is called "sweating."

When the vegetables release this moisture, it adds flavor to your dish. In low-fat cooking, this technique is a sure way to give food a great depth of flavor, especially soups and sauces.