Mirepoix is simply a ready-to-use blend of some basic ingredients—carrots, onions, & celery—just about every cook uses. Here, these three common ingredients have been washed, peeled, and—most importantly—chopped into a ready-to-use size, layered, and packaged in a recyclable, see-through tub. All that prep work… done. Just think about all the extra time you’ll have to focus on your culinary creations (or finishing that long-neglected novel) with these ingredients at the ready. Many cooks swear by Mirepoix as the essential start to soups, casseroles, and roasting meats. This combo can also be a key player in things like sauces, stuffing, and stir-frys.