Watch one of the BBQ Pit Boys show you how easy it is to barbecue chicken "low and slow", tender and juicy! Ingredients: 2 5-6lb. Roasting Chickens Olive Oil or Butter Soy Sauce Black Pepper Coat the chickens with equal parts oil/butter, and Soy Sauce. BBQ on your smoker, or with indirect heat on your covered grill at 250f for about 4-5 hours, or until the internal temperature of the chicken reaches 180f.