All you have to do is wash it. Be careful with the thorns.
Next, cut off all of the thorns and trim away the edges.
That's pretty much it. Dice and serve. The cactus can be eaten raw or cooked over medium heat with a little water, stone-crushed extra virgin olive oil, a pinch of sea salt, red pepper, and garlic. Also, I'm going to juice this tomorrow morning as well. I'm sure it will be delicious. Overall the plant has a very subtle taste and crisp texture. Nothing like anything I've tried before. Thanks Carla for broadening my horizons.