Pair with rich fish like salmon or trout (good sources of healthful omega-3 fatty acids), white-meat poultry (low in saturated fat), or pasta. You can also stir a bit into minestrone or steamed rice. Hearty walnuts add polyunsaturated omega-3 fatty acids, while olive oil is a good source of monounsaturated fats. Since a little of this zesty spread goes a long way, you may want to freeze leftover pesto in ice cube trays overnight and then transfer to a zip-top plastic bag. The bright flavor should last for up to three months.