Heat broiler to high. Place the tomatoes, corn, onion, and jalapeño on a rimmed baking sheet and broil, turning occasionally, until charred, 8 to 10 minutes; let cool.
Cut the corn kernels off the cob and transfer to a medium bowl. Roughly chop the tomatoes, jalapeño, and onion and add to the bowl along with the cilantro, vinegar, ½ teaspoon salt, and ¼ teaspoon black pepper. Mix to combine and serve with the tortilla chips.
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