To prepare snails for eating you can put them in a container with lettuce for a few days, which will help to get rid of the sand from inside them. Also, I think it is very important to cook them as they can carry parasites. I grew up in Perth, Australia and over there all the snails were escaped culinary snails, although I have never eaten any.
Offered by Jennifer.
Will snails live well after the poleshift? I think yes. There will be humid places for them all the time and they love it. I think they eat moss and there will be lots of it during those times. So here is a snail recipe:
Then taste it. You can improvise also!
Offered by Rui.