When ready to eat, allow the chicken to sit at room temperature as the grill is preheating. Drain and discard the marinade (or do like my husband likes to do and drizzle some of the marinade over the chicken as it cooks—just don’t consume it uncooked), and then grill the chicken over medium-high heat for 7-8 minutes per side or until the internal temperature reaches 165 degrees F. Total cooking time will vary based on size of chicken breast. (We like to grill the onion and lemon slices, too.) Remove to a platter and allow the chicken to rest for 5 to 10 minutes before serving.