Thank you to Natasha Laggan @trinicookingwithnatasha for the recipe.
One day before the cook, mix together salt, pepper, paprika, lemon pepper, complete seasoning, BBQ seasoning, citrus seasoning, green seasoning, pimento sauce, soy sauce, Worcestershire sauce, and the bitters. Marinate the chicken in the mixture in the refrigerator overnight.
Set the EGG for raised direct cooking without a convEGGtor at 250°F/121°C.
Remove the chicken from the marinade and discard. Once the chicken comes to room temperature place it on the grill skin side up. Grill for 40 minutes, flip and grill the other side for 40 minutes.
Add the tamarind, ketchup, and Big Green Egg Sweet & Smoky Kansas City Style Barbecue Sauce to a saucepan and simmer on low until pulp melts.
Baste the chicken with the sauce on both sides and allowing it to char. Cook until an internal temperature of 170°F. Remove from the EGG and enjoy!