Spray Instant Pot with nonstick spray. Put frozen roast and water/broth into pot. Put lid on, press the meat button and set to 70 minutes. Mix the BBQ sauce ingredients in a bowl and set aside. When beeps finished, do a quick pressure release. Turn the pot off. Transfer meat to a cutting board and trim off all fat or skin that is visible on the meat and discard. With two large forks, pull the meat apart into chunks. Pour off the beef broth from the Instant Pot and discard. Put the pulled beef back into the Instant Pot and pour the BBQ sauce over the top. Press the Saute button and mix the contents around. Continue pulling the meat apart with two forks as the sauce sautés into the beef. This takes less than 2-3 minutes, so don’t walk away. Here’s my version of a southern BBQ sandwich meal: Put 1/3 cup of the pulled BBQ meat on a whole grain hamburger bun that has been smeared with Kraft light Olive Oil mayonnaise. Top it with homemade sweet mayonnaise-based coleslaw and then put on the top of the bun. Serve with honey baked beans or homemade oven baked French fries.