Masa can be used for industrial purposes (tortillas, tamales, chips), but it must be used quickly because its glutens change rapidly and binding decreases rapidly.
There are also dozens of packed sodas -- lunch counters that offer rustic stews, mariscos, fried plantains, ceviche, empanadas, turtle eggs, tamales and world-class espresso.
Velvety chicken tamales steamed in some kind of leaf were a close second, but everything -- empanadas, quesadillas, burritos, tacos -- all tasted fresh and flavourful.