the fruit has a distinct warty exterior and an oblong shape. it is hollow in cross - section, with a relatively thin layer of flesh surrounding a central seed cavity filled with large, flat seeds and pith. the fruit is most often eaten green, or as it is beginning to turn yellow. at this stage, the fruit's flesh is crunchy and watery in texture, similar to cucumber, chayote or green bell pepper, but bitter. the skin is tender and edible. seeds and pith appear white in unripe fruits ; they are not intensely bitter and can be removed before cooking.