Place the poblano beneath a hot broiler and cook it until the skin becomes charred on every side.
Transfer the pepper to a covered bowl for 10 minutes, then remove the skin, stem, and seeds.
Dice the roasted poblano finely and place it in a mixing bowl with the corn.
Add the red onion, minced jalapeño, and chopped cilantro, distributing them evenly through the corn.
Pour in the lime and lemon juices, add the salt, and stir the salsa thoroughly.
Refrigerate for 15 to 30 minutes, then taste and adjust the citrus or salt before serving.