If buying a bone-in leg portion of pork (also referred to as fresh ham), ask your butcher to remove the bone and butterfly it.
Sour prickly cactus pears (xoconostles) are a perfect substitute for the chayote. Simply cut off both ends of 5 cactus leaves before removing the peel. Cut cactus in half, then remove the seeds before chopping the cactus; cook with the onions and garlic 5 min. before continuing as directed.