1How to Make it:
Heat oil in a medium saucepan over medium heat. Add the onion and garlic and saute for 5 to 10 minutes, or until onion is tender. Then add the ketchup, Worcestershire sauce, vinegar, brown sugar and water. Mix together well and season with salt and pepper to taste. Reduce heat to low, cover and simmer for 20 minutes. Set aside, covered, and let cool.
Place chicken in a shallow, nonporous dish and pour 1/2 sauce over chicken, reserving 1/2 sauce in a separate container for basting. Cover chicken and marinate in the refrigerator overnight.
Cover reserved sauce and keep in the refrigerator.
Preheat an outdoor grill for medium high heat and lightly oil grate.
Grill chicken over medium high heat for 8 to 12 minutes per side, basting occasionally with the sauce,until internal temperature reaches 180 degrees F (80 degrees C).
You can also bake in 350 oven for 20 minutes and then baste every 5 minutes after until chicken is done inside. It will be tender and Juicy, Enjoy Good Food