Prepare the ingredients as instructed above.
Make the Rice Pilaf: Heat olive oil in a pot over medium heat. Sauté the onion and garlic until the onion begins to soften. Stir in the broth and rice. Cook the rice according to package directions. Once cooked, season the rice with salt and pepper to taste.
Make the Watermelon Mint Drink: Mix the watermelon chunks, water, fresh mint, and ice cubes together. Refrigerate until ready to serve.
Mix the sauce with the chicken in a bowl.
Cook the BBQ Chicken: Preheat a grill or grill pan over medium heat. Season the chicken with salt and pepper. Grill, turning occasionally and brushing lightly with sauce, until the chicken reaches an internal temperature of 165°F (74°C). Set aside.
Grill the Corn: Grill the corn on all sides until tender and charred. Remove from the grill, spread butter over the corn, and season with salt and pepper.
Serve the BBQ chicken alongside rice pilaf, grilled corn, watermelon slices, and watermelon mint drink.