When fried it turns purple, which some say is why it is called the 'bishop', after the color of a bishop's robes.
A sausage of pork meat and organs with raisins, pine nuts, almonds and chile, sewn into a pig's stomach, then fried and chopped into tacos at markets and street stalls.
Why it's made this way: It comes from Tenancingo, south of Toluca, where it has been made since at least the 1930s and has had its own fair since 2004.