By Owen Juarbal
Most operators closely track food costs and other expenses, yet few know when their kitchen knives were last properly sharpened – and that can be an expensive blind spot in a year when more than a third of Canadian operators are running at a loss or breaking even. While nearly every other cost centre is getting attention, the knife roll is often forgotten, never sending an invoice, but taking a little more out of the operation every shift.
Where the money actually goes
Time is the first place the money goes; a cook who has a good edge gets into a routine and stays in it, while one who has a more rounded edge carries out every action twice – first the one that doesn’t go through, repeating it until the one that does. Over the entire prep list, involving three cooks and six days a week, this results in a labour cost that no one had approved.
What often surprises people is the yield – a sharp blade cuts through the cell walls, while a dull one crushes and tears them. The effects are seen later on: the herbs turn black at the edges after being stored, the tomato slices leak onto the plate, and the tenderloin is trimmed more than necessary since the cook could not tell where the silverskin ended and the meat began. Canada already wastes close to half the food it produces. A soft edge is a small part of that, but it lands on the most expensive product in the building.
Consider the plate, too. Restaurants sell consistency, but if a piece is cut brunoise style with a dull knife, it will be uneven and the pieces will cook at different speeds. This inconsistency can disappoint guests and deter repeat visits.
It’s usually a purchasing problem
When blades are returned for regrinding, the evidence suggests that it’s not the sharpening that has failed first. Most kitchens regard cutlery as if it’s a consumable item: buy it cheap, use it extensively, and then replace it. However, cheap knives are almost always stamped and punched from a sheet of soft alloy because it is easy to machine, not because it retains an edge. A blade made from such material can be sharpened on a Monday and already be worn out by Thursday.
In this case, the kitchen must sharpen the knife constantly or sharpen it very rarely, and in either case the knife is mostly dull during its working life. Forged kitchen knives are quite a different matter: the steel is worked rather than punched, the tang extends the whole length of the handle so that the blade doesn’t move when under pressure, and the cutting part is hard enough to maintain the edge that was originally given to it.
There is a trade-off, though: high-carbon steel takes a keener edge and holds it longer than stainless, but it needs hand washing, immediate drying, and it will grey over with a patina. That suits a chef’s knife for a chef who cares, but it is a poor choice for a station where everything goes into the dish machine at close. The steel should match the station: carbon where someone owns the blade, stainless where nobody does.
Buying once is usually cheaper than buying three times, though only one of those ever shows up on an invoice.
Consider safety
Most cooks, when asked which knife makes them nervous, point to the sharpest one, but that’s the wrong answer. The Canadian Centre for Occupational Health and Safety explains that dull edges require more force, and more force increases the chance of injury.
Anyone who has worked a line knows the mechanism: the blade skates across the skin of a tomato instead of biting in, so the cook leans harder, but the edge breaks through all at once with far more momentum behind it than the cut ever needed, and by then it is already moving. The wound may be worse, too, a tear rather than a clean cut, which is messier to close and slower to heal.
Cuts and punctures are the most common injury in restaurant kitchens, but the cost isn’t limited to the treatment. The cost is a prep cook off the schedule on a Friday in July, a manager pulled onto a station instead of running the pass, and a compensation file that follows the premiums around for years.
The solution
What’s the fix? Fewer knives, bought better. Most stations do not need a twelve-piece block. A chef’s knife, a paring knife, something for boning or utility work, and a serrated blade cover the overwhelming majority of what a kitchen does in a day.
Sharpening belongs to a person rather than to the team, with a name beside it on the prep list. Knives do not go dull because nobody knows how to sharpen them; they go dull because sharpening belongs to everyone, which means it belongs to no one.
Honing and sharpening are separate jobs, and kitchens conflate them constantly. A honing rod realigns an edge that has rolled over and should be used often, ideally at the start of a shift – it does not sharpen. Sharpening removes metal to rebuild the bevel, and that needs stones and someone competent, or an outside service on a standing schedule.
Storage matters, too. Leaving knives loose in a drawer is where edges die, knocking against steel all service. Using a magnetic strip, blade guards or a roll will do. Carbon steel stays out of the dish machine because one cycle undoes a month of care.
The tool they touch most
None of this shows up as a line item on a P&L, which is exactly why it survives. Nobody defends the dull knife; it just persists, quietly, because it never becomes anyone’s problem on any specific day. But an operator who walks the kitchen tomorrow and picks up the knife the busiest prep cook reaches for first will know where things stand in about four seconds.
Operators are hunting for savings right now and mostly finding hard choices: cutting hours, thinning the menu, raising prices on guests who have already pulled back. This one is not a hard choice. Sharp knives are faster, safer, gentler on the most expensive product in the building, and better on the plate. The tool a kitchen puts its hands on more than any other deserves more thought than it usually gets.
Owen Juarbal manages marketing for Battling Blades, helping share the craftsmanship, history, and culture surrounding swords and knives. Outside of work, he enjoys hiking, running, and spending time outdoors. He brings a practical, enthusiast-focused perspective to his writing.
