Katsuya

At Katsuya, the pork cutlet comes with cheese sealed inside it. Order the Gold Brick and the filling is premium cheddar; order the Silver Brick and it is mozzarella; order the two together and one pork loin carries both, cheddar's richness set against mozzarella's stretch beneath a single crisp crust. That is the premise of the whole operation — a Japanese restaurant on King Street North in Waterloo that commits almost entirely to tonkatsu, the breaded-and-fried pork cutlet most Japanese kitchens keep to a single line on a longer menu, and builds a short, deliberate list outward from that one anchor.

The filled cutlets are where the kitchen spends its imagination. The Sweet Potato Cheese Katsu folds mashed sweet potato in beside mozzarella, nudging the savoury pork toward something sweeter without ever leaving the cutlet format behind. The straight Gold Brick and Silver Brick keep it simpler for anyone who wants one cheese rather than both, cheddar in the first and mozzarella in the second. Beyond the katsu, the Original Karaage brings boneless chicken thigh with three sauces built to send it in different directions — wasabi mayo, teriyaki, and a Korean sweet-and-spicy — so a shared plate rarely tastes the same two bites running. And the Red Carbonara Udon answers the table that wants noodles instead of one more fried cutlet, a soft, saucy counterpoint to the crisp pork and chicken around it.

The menu reads as the work of a kitchen that would rather go deep than wide. Five ways to fill and fry a pork cutlet — cheddar, mozzarella, both together, sweet potato, and the plain original — is a great deal of variation to draw from a single idea, and each version makes its own small case for what a tonkatsu can be asked to hold: a stretch of mozzarella, a sweet edge, or nothing but the pork and the crust. Underneath the novelty is ordinary discipline. The breadcrumbs, the sauces, and the meat are prepared fresh every day, the kind of unglamorous routine that separates a cutlet worth crossing town for from one that merely survives the fryer.

Katsuya did not begin in Waterloo. The brand describes itself as Canada's first specialized tonkatsu restaurant and dates its start to October of 2015, and it has since grown into a multi-location operation, with the Waterloo kitchen keeping its own current menu. What travels between those locations is the method more than any single personality — the same filled-and-fried cutlet, made the same careful way whether it is plated at a table or packed for the drive home.

That portability is part of the design. The Waterloo location runs on walk-ins rather than reservations, opens through both lunch and dinner, and sends the same cutlets out for takeout and delivery that it plates in the dining room, with beer on hand for anyone settling in for the evening. None of it depends on booking ahead; a table can decide on the way over. It is a format that bends to how the night is going — a quick uptown lunch, a longer sit-down dinner, or a bag of katsu carried home without the food losing much between the counter and the kitchen table.

The natural way to eat here is by comparison. Because nearly every plate is a variation on the same technique, the table that orders widest gets the most out of a visit — a Gold and Silver cutlet beside a sweet potato one, the Original Karaage passed around for its three sauces, the Red Carbonara Udon holding down the softer end. Put those plates side by side and a single meal turns into a short tour of everything one kitchen can do with a breaded pork cutlet.