For the collard greens: Heat an 8-quart stock pot over medium-high heat and cook bacon until crispy. Add onions and cook on medium heat, 2 minutes. Add beef base, collard greens and 5 cups water. Simmer on medium-high heat until collard greens are tender, about 2 hours. Add salt and cider vinegar to season.
For the wagyu beef brisket: Preheat a smoker for cooking at 215 degrees F.
Trim brisket to 1/4 inch fat on the top side and zero fat on the bottom. Mix together salt, pepper and granulated garlic in a bowl. Lightly coat the brisket with mustard, then season generously with rub.
Place brisket in smoker and cook for 12 hours. Wrap brisket with butcher paper and place back in smoker. Raise heat to 275 degrees F and cook until meat reaches an internal temperature of 203 degrees F, up to 2 more hours. Let rest until it reaches 165 degrees F, about 1 hour. Remove from butcher paper and slice. (See Cook's Note.) Serve with collards.
Slice brisket against the grain. No BBQ sauce needed.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of Carolina Kitchen & Barbeque Co., Sparks, NV