Basically being really fresh and made one the day of consumption. Also cooling it well and making sure the pig was healthy.

Saw a YouTube video on it once. Tldr, the bad worms spread when an animal eats the meat of another infected animal. So, if you raise your pigs strictly vegetarian, they can’t catch that type of worm.

Also very strict testing and procedures, of course.

It being in the pig. Gotta eat straight from the source.