Cost per serving: $1.78
Miso, a thick paste usually made of fermented soy beans, is a common ingredient in Japaneses cooking. You can use lighter varieties such as shiro to flavor salad dressing, sauces and marinades. Find miso in the refrigerated section of the grocery store or on amazon.com. It keeps for several months in the fridge.
See recipe: Miso-Vegetable Soup