Having really enjoyed the Mexico City Nachos from Wahaca, I have now been making this dish quite often myself.
I used some tinned black beans, I also had some other mixed beans and sweetcorn. To this I added some tortilla chips, and then dressed the dish with guacamole, sour cream, grated cheese, a tomato salsa, Mexican cheese dip, and some homemade pickled red onion. I added some freshly chopped coriander as a garnish.
It was a really nice and fresh dish, and was a good but slightly different version of the dish I had in London.