Char the VeggiesPreheat a grill or cast-iron skillet. Grill tomatoes (cut side down), corn, poblanos, onion, and garlic until blackened in spots—about 10 minutes total. Rotate as needed. Let cool slightly.
Prep for BlendingPeel garlic and roughly chop all the roasted vegetables. For less heat, remove poblano seeds. Cut corn off the cob.
Blend the SalsaIn a food processor, pulse the tomatoes, peppers, onion, garlic, lime juice, and cilantro until chunky or smooth—your choice. Stir in the corn kernels. Season with salt to taste.
Chill & ServeLet sit for at least 15 minutes before serving, or chill for deeper flavor. The salsa gets better overnight!