Guayllabamba is a large, ugly, sweet fruit that is ugly on the outside and delicious on the inside. We stopped in a small town on the way back from Quisato and bought one from a vendor. The guide knew which one to pick and we didn’t buy from the first vendor because they weren’t ripe. Each fruit cost $2 which seemed high but they are not common and he said that was a fair price.
You can tear the fruit open and inside is a lot of white “meat” with large seeds in each section. You don’t eat the seeds but the meat is very tasty.