Ya know what does wonders for fresh lychee? Refrigeration. I'm not sure why, but chilling them improves & enhances their flavor. Since I can only get 'em in June & only when I'm paying attention, I tend to eat canned more often, but chilled fresh ones have a brighter flavor & less... um... squeaky flesh? if that makes sense? (Canned ones seem to squeak on my teefers when I eat 'em.)