Prickly pear, Opuntia spp., slice open the pad and apply the inside over wounds, bites, stings and envenomations.  The inner flesh is a chemotactic attractant, surfactant, drawing serum from the wound site cleaning it and sealing it.  Said to be a successful treatment for scorpion and recluse spider bites.

Food:  Flowers and buds are roasted and eaten.  Pads are de-spined, cooked and eaten. (More)

Roasting off spines of prickly pear.
Prickly pear sliced in half and applied over a wound, draws blood, cleans and seals wound.
Opuntia patch east of Cuernavaca, edible pads above. Above:  Edible flowers Opuntia