<human>:  What is the best recipe for cow tongue tacos?
<bot>: 
1. Start by gathering your ingredients: 1-2 cow tongues, canned black beans, taco shells or tortillas, cheese, salsa, lettuce, minced onion and cilantro, and any other favorite taco ingredients.
2. Begin by boiling the cow tongues for 1 ½ - 2 hours.
3. Heat a medium-sized skillet over medium-high heat and add a little olive oil.