Nut oils are delicious in vinaigrettes, mayonnaises, and even used alone as a sauce. Keep in mind that they are usually highly perishable, however, so that even the oil in unopened bottles is sometimes rancid. To avoid this, buy oils that are made from roasted nuts. The roasting accentuates the nutty flavor and extends the shelf life. For salads, nut oils can be combined with as much as ΒΌ cup canola oil, and the flavor of the nut oil will still shine through. When you are not using nut oils, keep them in the freezer.