Neat navegator!
If you should touch a tuna or a pitahaya (that's what the deep purple ones are called) that hasn't been peeled, the only remedy that works is to lightly and very rapidly brush the stuck part of your hand over your hair. It takes a full minute or two. But it will remove the offending spines.
The paddles of nopal can be skinned then the green center diced to pea-sized cubes. I heat a pan of water to boiling then dump the cubes in for a minute. This rids of cactus of the slimy texture. Rinse under cold water. Stir fry the "nopalitos" until they turn yellow or golden. Scrambled into eggs (Nopalitos con huevos revueltos) is maybe my favorite scrambled eggs preparation.
Having fish? Fish with bones?
Have a nice ripe banana handy.
What?
Let's assume someone didn't gulp a big big bone. That's first aid time at the clinic.
Hacking, gagging coughing.
Bite off an inch of the banana
Form it round with your tongue
Then swallow
95% of the time this fixes the problem
If not, a second try is sure to work.
Both of the above were shown to me by Mexican matriarchs.
Great going navegator! To be in Mexico is fabulous. To partake of unique foods is to come even closer to the country and the people. Jesus says to me. "Vamanos! Let's go! You can have your tacos al pastor!"