This salad is hearty enough to serve as a main entrée, thanks to the use of whole-grain barley and black beans, which are both loaded with fiber and plant-based protein. Paired with a zesty lime vinaigrette and your favorite taco toppings, this meal is bursting with bright flavors. Every bite is interesting, which keeps you coming back for more. Chop the vegetables for the salad while the barley is cooking to save time.