3 red bell peppers, cored and seeded but left whole
15 ears of corn, husked
1/2 cup extra-virgin olive oil
1 small red onion, halved and sliced thinly
1/3 cup fresh lime juice
1 teaspoon salt
Freshly ground pepper
2 cups chopped cilantro
Light a grill. Roast the peppers over a hot fire, turning, until charred all over, about 20 minutes. Transfer to a medium bowl, cover with plastic wrap and let steam for 10 minutes. Peel the peppers and cut them into 1/4-inch strips.
Brush the corn with 1/4 cup of the olive oil and grill over moderately high heat, turning, until charred in spots but still slightly crisp, about 7 minutes. Let cool slightly. Working in a large bowl, cut the kernels from the cobs.
Add the peppers and red onion to the corn. Stir in the lime juice and the remaining 1/4 cup of olive oil. Add the cilantro and toss well. Season with salt and pepper and toss again, then serve.