01 - 
                Rinse chicken thighs and pat dry.
              
              
              
                02 - 
                In a large bowl or gallon-size Ziploc bag, combine brown sugar, ketchup, soy sauce, pineapple juice, ginger, garlic, apple cider vinegar, cumin, black pepper, and paprika. Mix well.
              
              
              
                03 - 
                Remove ½ cup of the sauce mixture and set aside for serving.
              
              
              
                04 - 
                Add chicken thighs to the remaining sauce. Mix well so that all chicken is submerged in the marinade. Cover or seal and refrigerate for at least 4 hours, up to overnight.
              
              
              
                05 - 
                Heat grill to medium-high heat (400°F) and lightly oil the grates.
              
              
              
                06 - 
                Place chicken on the grill and cook for about 10 minutes without turning. Flip and continue cooking until the internal temperature reaches 165°F (about 10 minutes more). Discard used marinade.
              
              
              
                07 - 
                Add pineapple rings to the grill about halfway through chicken cooking time. Cook until golden on each side.
              
              
              
                08 - 
                Brush reserved marinade over cooked chicken. Optionally, broil the chicken for a few minutes or heat the reserved sauce in a small saucepan to thicken before brushing.