Mix together with plenty of salt and pepper in a small bowl. Average weight: 2 lbs. This slow cooker beef shoulder roast tastes fantastic, is fall off the fork tender, super flavorful, and is a great meal to throw in the slow cooker and forget about it. Ingredients. Take your beef out of the fridge, rinse it with cold water and pat dry with paper towel. The Wagyu beef chuck roast is dry-rubbed with a combination of (brown sugar, black pepper, salt, paprika, chili powder, granula