Tacos de Sesos

Carefully clean the Beef brains by removing any visible membranes and blood vessels under cold running water. Cut the White onion into halves and peel the Garlic cloves.

In a pot, bring about 2 liters of water to a boil with one half of the White onion, 10 grams of Garlic cloves, 1 gram of Bay leaf, and 5 grams of Salt. Add the cleaned Beef brains and simmer for 20-25 minutes, or until the Beef brains are firm to the touch. Drain and let them cool completely.

While the Beef brains cool, prepare the salsa. Roast the Tomatillos and Serrano chiles on a comal or dry skillet over medium heat until softened and lightly charred on all sides. Peel the remaining 10 grams of Garlic cloves.