Return the liquid to a boil; add the couscous, butter, salt, and pepper. Remove the pan from the heat, cover, and let stand 5 minutes. Fluff with a fork before serving.
Art's advice: Even though the original recipe uses unsalted butter instead of olive oil, it is still relatively low in fat. You may choose to use oil instead of butter, but the fat and calories remain about the same. If you omit the butter or oil altogether, the calories are reduced by one-third, and the fat is eliminated.