Brain tacos with a creamy, delicate filling are a classic Mexican street food experience. This high protein, keto-friendly dish is a fresh option for carnivore diet enthusiasts.
Rinse the beef brains thoroughly in cold water, removing any membrane, and soak for 30 minutes to reduce impurities.
Bring a large pot of water to a gentle simmer over medium heat; add brains and poach for 10 minutes until firm but tender. Drain and cool.
Chop the blanched brains into bite-sized pieces. In a large skillet over medium heat, add olive oil, then sauté diced onion and minced garlic until translucent.
Increase heat to medium-high, add the chopped brains, salt, and black pepper to the skillet. Sauté for 4-5 minutes until lightly golden, taking care not to overcook to maintain creaminess.
Warm the corn tortillas on a dry skillet over medium heat until pliable, 30 seconds per side. Spoon brain filling onto tortillas, top with fresh cilantro and a squeeze of lime to serve.