Puebla de Zaragoza Barrio San Antonio Mercado 5 de Mayo. 9 of 15. A mercado butcher display of tripe and liver. Oh my churning stomach, next photo please. Tripe is the edible lining of an animal's stomach, particularly those of ruminants like cows, sheep, and goats. It's a type of offal, meaning it's a food byproduct, and has been consumed by humans for centuries.