What particular nut could actually kill you if not prepared properly?

Question

By the manufacturer.

Answer 1

Cashews must be cooked, they are toxic. Cashews labelled "raw" aren't really. They also have a caustic outer coating that requires careful handling.

Wild Almonds are also toxic. Domesticated varieties aren't though.

Answer 2

If you're allergic to a certain nut, you can get a severe allergic reaction that would require immediate attention. I don't know what you mean by manufacture preparation. It is not blow fish.