To remove the spines from the pads.
One way:
https://www.thesurvivalgardener.com/removing-spines-cactus-pads/
Another way: I have put on google for safety and used tongs tp hold them and scraped them with a serrated knife.
( I didn't want it to pop a spine into my eyes. You probably wouldn't have it happen
but I wanted to be careful.)
If you scrap carefully to remove the spines by getting under spines into the skin of the cactus,
you can get the spines off.
The pads are acid and mucilaginous. I wouldn't eat solo. Texture is good like green beans, but the mucilage
is thick and dense around the pieces.
The nopales (catcus pads) sold in Spanish/ Mexican grocery stores have been found to have higher levels of pesticides. I only use
what I can harvest myself.