You want a triangular shaped sharpening system that includes a medium sharpening surface and a fine sharpening surface. This makes it much easier to sharpen the curved blade. Start with the medium grit and stroke the blade along the surface in one, smooth motion, keeping the blade pointed away from you. Make sure that you use the same number of strokes on one side as you do on the other. Then, switch to the fine grit surface and repeat the process until you get the sharpness that you want. When you’re done, wipe the blade with a soft, dry cloth to remove the debris from the sharpening process.