Separate and wash the celery stalks. Shake off any extra water. Cut the leaves off the top of the stalks. Most of the bitterness comes from the leaves. Roughly chop the celery into pieces. If you have a Vitamix or BlendTech, you can probably cut the celery into 3 to 4 inch segments. Yet if you are unsure how powerful your blender is, chop it smaller. Place the chopped celery in the blender. Make sure the lid is on tight. Puree on high until the celery is smooth mush. Place the mesh strainer over the glass. Pour the celery pulp into the strainer and wait for the juice to separate down below. When it starts to slow, press the celery pulp with your hand (or a spoon) to squeeze out all the juice. Discard the pulp.
