Here are step-by-step instructions for harvesting prickly pear fruit, removing the Cooking prickly pear jelly with lemon peels to provide pectin. The opuntia, or prickly pear cactus, produces luscious fruit that can be made into jelly, wine and many other products. It also calls for liquid pectin, but powdered seems to jell a little better. recipe is written in a relatively old-fashioned way, it is perfectly safe if processed using modern methods. Pluck the fruit from the cactus with a long handled fork or tongs. I've concocted a new prickly pear jelly using low-sugar pectin that substantially 4 cups prickly pear juice (requires around four pounds of fruit) .. would set up a sufficiently acidic environment for safe canning in a water bath. The fruit of this cactus family is commonly referred to as Prickly Pear but is also In a bowl, whisk one cup of sugar with the pectin then add to the fruit mixture. Hard boil cactus fruit juice, pectin and lemon juice for 3 minutes. .. I'm sure the inversion method is probably very safe, but the USDA does not.