My new addiction!:) Lucuma is a South American fruit related to sapotes and mameys.The flesh is somewhat dry and crumbly and has an amazing flavor that can be described as having notes of caramel ,maple syrup,or sweet potato.It is a popular ice cream flavor in Peru.No sweetener is needed in any recipe where lucuma is used.It can be found as a frozen pulp in the US.Goya sells it in convenient 14 ounce bags in the frozen food section at Latin grocery stores and some large markets.These are what I buy and I just use half a bag at a time for my smoothies.If you come across it I suggest trying some right away; it's a flavor that won't soon be forgotten.