Cut the peel off of the grapefruit and cut it into wedges.
Core the apple and cut it into slices.Juice the grapefruit, apple, and beet together. Serve immediately or save in glass bottles for later consumption.
This recipe won't blend well as it's made for a juice extractor. If you'd like to blend, a general rule for converting a juice into a blended juice is to cut the recipe ingredients in half and add 1/2 - 1 cup water.