Wash the bitter melon and cut it in half lengthwise. You don't need to peel it.
Scoop out the seeds and the white flesh surrounding them with a spoon and discard.
Place the bitter melon peel side down and cut it into bite-size pieces.
Add it into a juice along with enough water to have the consistency you like. Add lemon juice and salt to taste. The juice is bitter to taste; it's best to have it quickly when it's freshly made.
You can make different versions of this juice by adding celery stalks or apple while juicing. You can also add honey. However, adding a fruit or honey will affect the way it helps manage blood sugar levels due to the natural sugar content in them.