I bought a "cactus pear" from walmart how should I cook it? It is green, not red, so does it need to ripen?

A cactus pear can be purple, orange, garnet red or green. You know it's ripe when the fruit gives to gentle pressure -- so don't rely on the color alone. You don't have to cook it to eat it, just cut off each end, slit the sides, then peel off the skin. Enjoy!