Our banana muffins are bestsellers and have been from the day Mangia opened in February 1982. They are filled with golden raisins and pecan pieces, but the real twist is the walnut oil we add for flavor. It is an extravagance, but well worth it. If you don't have walnut oil, use safflower or canola oil. The flavor of the muffins won't be the same, but the moist crumb will be every bit as tender. For maximum flavor, use bananas that have ripened until the skins have become black; they are unsightly, but also very sweet.