How to Make It
Heat a large grill pan. Brush the corn with olive oil and season with salt and pepper. Grill over moderately high heat, turning, until crisp-tender, about 12 minutes. Let cool.
Meanwhile, in a small bowl, combine the onion and lime juice and let stand for 10 minutes. Stir in the syrup, jalapeño and 2 tablespoons of oil and season with salt and pepper.
Working in a large bowl, cut the kernels off the cobs in sections. Add the onion dressing and toss. Add the mint, parsley and cilantro and toss again. Serve warm.