Calamondin orange tree fruits are best used within a week of picking. The fruits are sometimes juiced and used as you would lemon or lime juice in cooking or to make a refreshing drink. They can also be used in desserts, gelatins, jellies, or in any recipe that calls for lemon or lime juice. The juice can be used as a clarifying hair rinse, and rubbing it on insect bites alleviates itching. Although the raw flavor is somewhat tart, you can also eat them right off the tree.