Wash the produce (cucumber, celery, and peppermint).
Peel the grapefruit and leave as much white on the fruit as possible. All the good nutrients are in there! Chop if necessary to fit your juicer.
Add the ingredients in your juicer. You can cut the cucumber and mix the order, so you put once piece of cucumber, followed by a piece of grapefruit, followed by peppermint etc...
Stir your juice thoroughly and pass it through a sieve