I discovered elote during my first year in NY at this great little place, Cafe Habana. It took me forever to realize the secret ingredient is mayonnaise. I always bring this to outdoor cookouts in the summer - everyone loves it! Cotija cheese can be found at any Mexican grocery store, but if you can't find it, I've heard Parmesan is a good substitute.
Ears of corn (however many you want)
Shuck corn, leaving husk on. Wrap husk back and grill for roughly 15 minutes, turning, until hot.. Remove husk, slather each ear with mayo and then roll corn in the cheese to stick. Sprinkle with cayenne and lime juice and enjoy!