Dice celery, onion and garlic. Add to crock pot. Cut chicken into big strips and mix into crock pot. Cover all of that in chicken broth, stir and cook on high for 4 hours.
Combine all ingredients in "Relish" category in a food processor. Blend then set aside. Relish is ready!
Remove the chicken from pot and strain out liquid - DON'T SKIP THIS. Chicken should be moist, but not runny. Shred the chicken with two forks, return to the slow cooker. Add 1/2 cup or more (to taste) of your buffalo sauce, stir and let sit for 30 minutes on low.
To prepare lettuce cups, place 1/2 cup buffalo chicken in each leaf, top with 2 tbs relish (more or less if you like). Wrap up and dig in.
