Whitechapel's Knife Sharpener
Japanese whetstone technique. Razor-sharp results.
What Our Clients Say
★★★★★I sent KOJI three of my most neglected kitchen knives and got them back sharper than they were out of the box. My Victorinox feels like a completely different blade now.
★★★★★Attended one of the sharpening seminars and learned more in two hours than I had from years of YouTube videos. George really knows his craft and explains everything with patience.
★★★★★We use KOJI for our restaurant knives every fortnight. The consistency is brilliant — every blade comes back with the exact same edge profile. Wouldn't trust anyone else with our Misono set.
Professional Knife Sharpening and Education
Whether you need a single chef's knife restored or want to learn the art of whetstone sharpening yourself, KOJI has you covered.
Knife Sharpening
KOJI uses traditional Japanese whetstones to restore your blades to a precision edge. Suitable for kitchen knives of every style — from Western chef's knives to Japanese single-bevel blades. Each knife is assessed individually, sharpened to the correct angle for its steel and purpose, and returned with a cleaner, longer-lasting edge than machine grinding can achieve. Serving home cooks and professional kitchens across East London.
Seminars
Learn to sharpen your own knives with confidence. KOJI seminars teach the fundamentals of whetstone technique — stone selection, angle control, pressure, and burr formation — in small, hands-on sessions. You'll leave understanding how to maintain your knives at home between professional sharpenings. Ideal for home cooks, culinary students, and chefs who want to deepen their relationship with their tools.
The Craft Behind the Edge
KOJI was founded on a simple belief: a sharp knife is a safer knife, a more enjoyable knife, and a more respectful way to handle food. Based in Whitechapel, we bring traditional Japanese whetstone sharpening to East London's home kitchens and professional restaurants alike.
Every blade that comes through our hands is treated individually. We assess the steel, the existing edge geometry, and the knife's intended purpose before selecting the right stones and angles. There are no shortcuts — just patient, precise handwork on natural and synthetic Japanese whetstones.
Beyond sharpening, we teach. Our seminars give cooks and chefs the knowledge to maintain their own edges between visits, building a deeper connection with the tools they use every day.
KOJI in Numbers
From Dull to Razor-Sharp
Get in Touch
Assessment
Sharpening
Quality Check and Return
Ready to Restore Your Edge?
Quick turnaround, honest pricing, and blades returned sharper than new.
Knife Sharpening FAQs
We sharpen all kitchen knives — Western-style chef's knives, Japanese gyutos, nakiris, petty knives, cleavers, bread knives, and more. If you have specialist blades like single-bevel deba or yanagiba, we handle those too with appropriate technique.
Whetstone sharpening removes far less metal than machine grinding, preserving the life of your blade. It also produces a more refined, longer-lasting edge because the steel is cut cleanly rather than torn by friction heat. The result is a sharper knife that stays sharper for longer.
Most knives are returned within 48 hours of drop-off. If you have a large batch or knives needing significant repair work, we'll let you know the timeline upfront.
Pricing depends on the type and condition of the blade. Get in touch with the number and type of knives you need sharpened and we'll provide a clear quote before any work begins.
Yes, we offer collection and delivery within the Whitechapel and wider East London area. We can also arrange postal sharpening for customers further afield.
Small, hands-on workshops where you learn whetstone sharpening technique from scratch. You'll practise on real stones with your own knives and leave with the skills to maintain your edges at home. Sessions run regularly — contact us for upcoming dates.
Yes, in most cases. Minor chips can be repaired during the sharpening process. Significant damage may require additional work on a coarser stone, which we'll discuss with you before proceeding.
Get in Touch
Send us a message to book a sharpening, enquire about seminars, or ask anything about blade care.
Where patience meets precision
Every blade tells a story. KOJI listens to the steel, reads the edge, and restores what time and use have dulled — one careful stroke at a time.
Testimonial
Every knife has a best edge waiting to be found. Our job is to find it.
George Lishman Founder, KOJI
