Walnut oil
Credit: Photograph by Nick Ferrari

Walnuts are high in omega-3s, making this oil healthier than peanut oil when you're looking to add the hint of a nutty flavor. Just don't substitute walnut for peanut oil or butter when cooking: With a low smoke point, walnut oil is best as a dressing or spread.

Try it: Use it as you would butter to flavor cooked foods such as grilled fish, pasta, and sautéed greens – after they're cooked. Or whisk it with a little honey and spread it on whole-grain toast.