This fruit looks different from its relatives (passion fruit and granadilla). Tumbo has an oval shape, about 5 inches long, but its skin has the same yellowish color of the passion fruit we call maracuyá. If you cut tumbos in half, lengthwise or across, you will find hundreds of black seed, each one inside a bubble of orange and sweet-sour juice. This is used to make refreshments, desserts and ices. It has the acidity and the color of its relatives, only milder.