BBQ Jackfruit Brisket

Name: BBQ Jackfruit Brisket
Ingredients: Nonstick cooking spray; 2 cups vital wheat gluten; 2 tablespoons smoked paprika; 1 tablespoon kosher salt; 2 teaspoons chili powder; 2 teaspoons granulated garlic; 2 teaspoons ground yellow mustard; 2 teaspoons onion powder; 2 teaspoons freshly cracked black pepper; 2 teaspoons rubbed sage; Two 7-ounce packages unseasoned shredded jackfruit, such as Edward & Sons; 8 ounces shiitake mushrooms, finely chopped (see Cook's Note); 1 cup mushroom stock; 1 teaspoon liquid aminos; 2 cups ketchup; 12 ounces dark stout beer; 1/3 cup dark brown sugar; 1/4 cup mushroom stock; 3 tablespoons apple cider vinegar; 2 tablespoons tomato paste; 1 tablespoon smoked paprika; 2 teaspoons onion power; 1 teaspoon chili powder; 1 teaspoon kosher salt