Grill chicken, basting with marinade and flipping occasionally, until charred and an instant-read thermometer inserted into thickest part registers 165°, about 8 minutes per side. Transfer to a plate.
05In a medium bowl, toss pineapple with oil. Grill pineapple, flipping occasionally, until charred, about 2 minutes per side.
06Transfer chicken and pineapples to a platter. Top with scallions.