1. Soak the stone in water for 5 to 10 minutes.
2. Fit the stone into its silicone holder and set it on the bamboo base, on a flat worktop.
3. Clip the angle guide onto the spine of the knife. It helps you keep the blade at the same angle.
4. Choose your grit: 1000 for regular sharpening, 400 first if the edge is very blunt or chipped.
5. Rest the edge on the stone and push the blade forward along it, with light, even pressure. Work from heel to tip.
6. Turn the knife over and give the other side the same number of strokes.
7. Add a little water whenever the stone starts to dry.
8. Repeat on the 3000 grit side, then on the 8000 grit side, to refine and polish the edge.
9. Rinse the stone, let it dry and store it dry. Wipe the blade clean before you cook with it.
Keep your fingers on the flat of the blade, away from the edge. If a stone wears hollow, rub the small flattening stone over it until it is level again.