People have enjoyed the sharp, sometimes bitter, taste of celery for thousands of years, and have also used the vegetable as a flavoring or for medicinal purposes. When eaten raw, one part of celery has always posed an uncomfortable problem: The strings, also called ribs, tend to get caught in the teeth. These are thick and durable strands running along the outside length of the stalk. Removing the string from celery is simple and can make eating it much more enjoyable.
Flip the celery over on the cutting board so the "U" shape is facing downwards and the ribs upwards.
Tilt the celery slightly to one side and insert the vegetable peeler slightly under the skin at one end of the vegetable stalk, slightly underneath the first rib on that side.
Run the peeler all the way to the bottom of the rib, completely removing it. Alternatively, run the peeler to the middle of the rib, remove it, and pull the rib off of the stalk with your fingers.
Repeat this with all the different ribs, slowly turning your grasp on the celery to accommodate access to the other ribs.
Rinse the celery under running water when the ribs have been removed, to ensure that all smaller pieces have been removed. Use or eat as desired.
If the celery is going to be chopped into slices less than 1/2 inch thick, then removing the ribs makes little difference.