Preheat grill to medium high.
Cut skin off pineapple and cut into ½" disks.
Combine olive oil, brown sugar, and ginger in a small bowl. Add to pineapple, toss well to coat, and marinate for at least 30 minutes or up to 24 hours.
Remove pineapple from the marinade and sprinkle with salt.
Grill pineapple 3-4 minutes per side or until brown sugar caramelizes.
