Wash the carrots thoroughly under running water.
Peel the carrots using a vegetable peeler.
Chop the carrots into small pieces.
Peel and segment the orange, removing any seeds.
If using, wash and peel the ginger, then cut it into smaller pieces.
Place the chopped carrots into the juicer.
Add the orange segments to the juicer.
Include the ginger if desired.
Squeeze in the lemon juice for added flavor.
Blend the ingredients until smooth, adding water as needed.