Grill or grill pan on medium-high heat. Add pineapple and cook until edges begin to brown, about 2-3 minutes per side.

Chop the cooled pineapple into pieces that are 1/2 inch.

Combine the pineapple with the onion, jalapeño, cilantro, lime juice, oil, and salt.

Allow to rest 10 minutes for the flavors to meld, then taste and adjust the salt, if necessary.