Not for the faint of heart - these beef birria tacos are heart attacks on a tortilla. The beef birria is already rich and delicious - the addition of the bone marrow puts it over the top...double down on the onions, coriander and radishes to compensate. Also, the salsa is delicious. But regardless of the ingredients - these are well and truly delicious. One is in Tijuana and the original is on the road to Ensenada. They are equally great.