Beef tripe simmered in a rich tomato and chile salsa until tender and flavorful. This protein-rich, traditional family dish offers bold flavors prized in Mexican home kitchens.
Rinse beef tripe thoroughly under cold running water, then cut into bite-sized pieces.
In a large pot, add tripe, cover with water, bring to a boil over high heat, and skim off any foam for 10 minutes.
Drain tripe, add fresh water, bay leaves, and simmer gently over medium-low heat for 1.5 hours until tender.
Meanwhile, heat vegetable oil in a skillet on medium; sauté onion and garlic for 3 minutes, then add tomatoes and chile guajillo. Cook for 5 minutes, stirring often.
Blend sautéed vegetables with cumin, salt, and pepper to make a smooth salsa. Pour salsa into the pot with tripe and simmer for another 30–45 minutes, stirring occasionally, until Mondongo is deeply flavorful and sauce thickens.