GRILL CORN: Grease and heat grill to high heat (450 degrees). Lightly brush each ear of corn with olive oil and add to the hot grill. Cook for 2-3 minutes on each side, rotating the corn until all of the sides are charred, about 10-12 minutes. Once cool enough to handle, cut the kernels off of the cob and transfer to a medium bowl.
OR SKILLET CORN: Cut the kernels off of the cob or use frozen (no need to thaw) or drained canned corn. Heat 1 tablespoon olive oil in large cast iron skillet over high heat. Add the corn and cook, stirring occasionally, until corn starts to char, approximately 5-7 minutes. Transfer kernels to a medium bowl.
ASSEMBLE: Add all of the remaining Corn Salsa ingredients to the bowl and toss to evenly combine. Season with additional lime juice and/or salt and pepper to taste. Set aside (tastes best if allowed to rest for 20-30 minutes).