If you are worried about toughness,freeze O,pus then defrost & start from scratch.Freezing tenderises them. Lot of Spanish recipes for O,pus. There is bit of a difference in species the big guys have different skin can be a little tricky,plunge into boiling water out into cold repeat x 3 skin will come off.
I do like them cooked with chorizo or bacon,paprika,onions,garlic,chilli or what the Galacians call " fairgrounds style" boiled then dressed with flavoured olive oil.
I do like them cooked with chorizo or bacon,paprika,onions,garlic,chilli or what the Galacians call " fairgrounds style" boiled then dressed with flavoured olive oil.