Mac and cheese is the best part of any barbecue, and we'll defend that.

Rub the corn with oil and grill over medium-high heat, turning often, for 10-12 minutes until charred in spots.
Cool slightly, then slice the kernels off the cobs.
Toss the kernels with the chili, lime juice and mayonnaise.
Transfer to a platter and crumble over the feta.
Scatter with coriander and a dusting of chili powder before serving.