Image credit to: Chris McIntosh for Boston Organics
Prepare a grill, heating to medium-high.
As the grill heats, shuck the corn, removing any residual silk with a kitchen brush or clean dish towel.
Put corn on the grill and cook until kernels begin to char, about 3-5 minutes, then turn. Continue cooking and turning until all sides are slightly blackened. Remove from heat.
Mix together mayonnaise, lime juice, chili powder and a little salt and pepper in a small bowl. Taste and adjust seasoning, adding more lime juice or chili powder if you like. Brush mixture on corn before serving.