Prickly Pear tunas are turning ripe this time of year. Tuna are the fruit of the prickly pear cacti that ripen after it flowers. Prickly Pear Jelly has a unique flavor I wouldn't begin to know how to describe, but it's good. My neighbor has a nice crop of tunas this year and I decided to try my hand at making jelly. I searched the web for recipes and tips then got started.