The Shamrock flavor, often associated with the color green and Saint Patrick's Day festivities, actually has nothing to do with shamrocks.  Instead, its tart and refreshing taste are derived from the key ingredient, lime oil. In fact, many popular sodas, candies, and cocktails also use this ingredient in their own versions of the Shamrock flavor. The lime oil used in these products comes from the peel of the lime fruit, which is distilled and mixed with other flavoring compounds to create a unique taste profile.