What is the best chicken marinade for a taco? In Chicago there is El Famous Burrito, does anyone know ...?

their recipe? They also have a killer pork recipe. The chicken is like a chicken paste, it's not annatto seeds or anything like that. I would like to know of this chicken taco marinade as I am in Taiwan and there is nothing close to good mexican food. (there is a Chipotle knock off but its just not the same) Someone help! It's hard to find tortilla chips, tortilla shells so I will need to make those as well, but first and foremost that chicken taco recipe that El Famous has is phenomenal!