Slow-Cooker Chinese Barbecue Beef

Name: Slow-Cooker Chinese Barbecue Beef
Prep time: 30 min
Cook time: 7 h 30 min
Total time: 8 h
Cuisine: Chinese
Ingredients: 1/4 cup hoisin sauce; 1/4 cup honey; 3 tablespoons ketchup; 2 tablespoons low-sodium soy sauce; 1 tablespoon sambal oelek (or other Asian chili sauce); 1 2-pound boneless beef chuck roast, halved lengthwise; 2 teaspoons Chinese five-spice powder; Kosher salt and freshly ground pepper; 4 carrots, cut into 1/2-inch pieces; 1 turnip, peeled and cut into 1/2-inch pieces; Cooked white rice, for serving (optional); Sliced scallions, for topping