These lemons have a long history, but all we really want (or need) to know is that they are incredibly sweet, given their low acidity. Given their orange color, they're often believed to be a hybrid between a lemon, mandarin, and sweet orange (via Oscar Tintori). Just look at a photo of the fruit and you'll see the similarities. Otaheite lemons are small and round, almost squat. They tend to grow in clusters, their gorgeous orange color juxtaposed against the dark green of the leaves.