Preheat oven to 350 degrees
Brown chicken pieces in Pam in a cast iron skillet. Salt and pepper chicken, turn. Take chicken out of pan, brown onion and celery. Add mustard, vinegar, ketchup, brown sugar, lemon juice, water and Worcesterhire sauce. Simmer for 30 minutes. Add chicken back to sauce.
Bake for 1 hour.
Grandmother Willis found this recipe when Amanda and Steve were little, it's been a hit ever since.