In a large bowl, whisk together brown sugar, ketchup, soy sauce, pineapple juice, apple cider vinegar, ginger, and garlic to create the marinade.
Set aside ⅓ cup of the marinade in a small container for basting later.
Trim excess fat from the chicken thighs and place them in a zip-top bag or sealable container. Pour the marinade over the chicken, seal, and refrigerate for 6 to 8 hours.
Preheat your grill to medium-high heat and lightly oil the grates.
Grill the chicken for about 5 minutes on each side, or until it reaches an internal temperature of 165°F.
Use the reserved marinade to baste the chicken during the last minute of cooking.
Remove the chicken from the grill and let it rest for 5 minutes before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in a skillet or microwave.