Husk the corn ears and rinse to remove silk.
Heat grill on med-high heat*.
Grill corn, turning until evenly nicely browned, 10 to 15 minutes. Let cool.
Cut corn from cob into a bowl; combine with remaining ingredients.
Cover and chill in the refrigerator until ready to serve.
Garnish with chopped cilantro and arranged avocado slices.
* I use a cast iron grill pan and it works really well for indoors. Grilling adds alot of flavor and texture to fresh Summer corn.