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Trim off the tip of the ginger. Remove the skin. Scrape the ginger along a cheese grater.
A knob of ginger will have one rounded edge that was not previously cut. Cut off this edge using a sharp knife from your kitchen, like a butcher or pairing knife. Both ends of your ginger should be flat. Stand the ginger upright on one of its flat sides. Slide your knife along all sides of the ginger to remove the skin. If you prefer, you can use a potato peeler. However, it's quicker to simply slice off the sides. Hold a cheese grater over a bowl at an angle. Press your ginger against the grater. Swipe it across the grater using long, steady motions. Keep grating the ginger until it's completely grated in a fine pulp.