Underripe cantaloupe is lacking in flavor and sweetness. But, you can still use it to make delicious dishes or beverages. Turn it into soup, gazpacho, or smoothies. Better yet, you can ripen it at home. Place it inside a brown bag with ripe avocado and keep it at room temperature. Open the bag after a day or two to check if it has ripened enough. Be careful because it can go from ripe to overripe very quickly.