Barbara Bush blends lemon juice, yellow mustard, ground red and black pepper, and Worcestershire sauce into her own barbecued chicken recipe. The aroma of the dish is almost as delicious as the taste. Preparing the chicken takes approximately 30 minutes. Marinate the chicken for 24 hours, and cook it for 70 minutes. Grill for 50 to 60 minutes or until chicken is done (170 degrees F for breast meat and 180 degrees F for thighs and legs), brushing often with barbecue sauce for the last 10 minutes of grilling. This barbecue favorite makes about four servings.