Combine the lemonade concentrate, soy sauce and brown sugar in a skillet and whisk to combine. Add the chicken and cover the pan. Turn the heat on to medium and cook for 8 minutes. Uncover the pan, turn the chicken, and continue to cook, basting the chicken as it cooks, until the sauce thickens and the chicken is cooked through, about 7 more minutes.
Combine the rice, pineapple, butter and chives in a large skillet. Heat over medium-high until warm, 3-5 minutes. Season to taste with salt and pepper.
Serve the chicken over the pineapple rice.
