Slice fat cap then add rub to all sides, wrap in plastic place in fridge 8-18hrs

Slice onion and spread on pan. Place meat (fat side down on grate) Season

Place pan with water under meat with coals on both sides add water to pan

275° for 6hrs maintain 275° putting more charcoal on both sides of grill. Baste with drippings. Adding additional water or apple juice. (Till 145° internal temperature)

Wrap in foil and cover in towel for 1hr to rest