A katsu sando is a Japanese sandwich of a breaded, fried cutlet, usually pork, between slices of soft milk bread, with tonkatsu sauce and shredded cabbage. To make one that slices clean, pound and score the pork so it stays flat, shred the cabbage fine, press the finished sandwich for a few minutes, then trim the crusts and cut it in one steady pass with a serrated knife.

The cut is the reason people photograph it. A good katsu sando shows a neat cross-section: white bread, a thin line of sauce, pale green cabbage, a golden crust and the pork at the center. Getting there is mostly knife work.

The sandwich has company on the shelf now. Whole Foods Market’s trend forecast for 2027 picks out Japanese comfort food, from milk bread to curry, and mentions katsu and tamago sandwiches among the Japanese convenience-store foods drawing attention online.

What goes in it

The name means cutlet sandwich. Tonkatsu, the breaded pork cutlet, is the usual filling, though chicken or beef cutlets are also used. The bread is Japanese milk bread, shokupan, soft and square. Tonkatsu sauce is the seasoning, sometimes with karashi, a Japanese mustard much stronger than the American kind, and julienned cabbage often goes in with the cutlet.

For two sandwiches you need:

  • 2 boneless pork loin chops, about 1/2 inch thick
  • Flour, 1 beaten egg and panko for the breading
  • 4 slices of shokupan
  • 1 large leaf of green cabbage
  • Soft butter, mustard and tonkatsu sauce

Just One Cookbook’s recipe uses those proportions: two half-inch loin chops for four slices of shokupan.

Prep the pork

Raw pork gets its own surface. The FDA advises one cutting board for fresh produce and a separate one for raw meat, poultry and seafood, so do this step on a dedicated board or a sheet of parchment, and wash everything with hot soapy water afterward.

  1. Score the edge. Pork loin chops have a band of fat and connective tissue along one side, which can make the cutlet curl as it cooks. Just One Cookbook makes a few slits through the connective tissue between the meat and the fat so the cutlet stays flat. Cut short slits, about 1/2 inch apart, from the fat into the edge of the meat.
  2. Pound it even. Lay the chop between two sheets of plastic wrap and pound it to an even thickness, a little thinner than you started. The method is the same as for chicken, which how to pound chicken cutlets walks through.
  3. Square it to the bread. Hold a slice of shokupan over the cutlet. If the meat hangs well past the bread, trim it now so the cooked cutlet sits inside the crust line. A cutlet that fits the bread is the secret of a clean cross-section; overhang ends up in the trimmed crusts.
  4. Bread it. Dust with flour and shake off the excess, dip in beaten egg, then press into panko so the crumbs stick.

Cook it through

Fry the cutlets in neutral oil, or bake them. Just One Cookbook’s version toasts the panko in a pan first and bakes the breaded cutlets at 400°F for about 20 minutes, until the pork is cooked through.

Either way, check the center with an instant-read thermometer. Whole cuts of pork are safe at 145°F, followed by a 3-minute rest, the CDC’s guidance. Use the rest to lay out the bread and sauces.

Shred the cabbage while it cooks

Cabbage in a katsu sando should be shredded as fine as you can cut it, so it sits in a soft, even layer instead of pushing the bread apart.

Cut out the thick rib of the leaf, roll the leaf up tightly, and slice across the roll into threads about 1/16 inch wide. Keep your knuckles against the flat of the blade and let the knife do long, smooth strokes. How to shred cabbage for coleslaw covers the same cut for a whole head. Pat the shreds dry; wet cabbage makes the bread soggy.

Build and press

  1. Spread soft butter on one slice of bread, then a thin layer of mustard. Just One Cookbook notes the butter acts as a waterproof guard, so the sandwich does not go soggy.
  2. Spread tonkatsu sauce on the second slice.
  3. Lay the cabbage on the buttered slice, set the cutlet on top, and drizzle a little more sauce over the cutlet.
  4. Close the sandwich with the sauced slice facing down.
  5. Press it. Just One Cookbook sets the assembled sandwich between two plates for 5 minutes so the fillings settle together. A light weight on top does the same job.

Pressing is the step that makes the slice clean. A loose sandwich shifts under the knife and the cutlet slides out the side.

Slice it clean

Use a serrated bread knife, or a long, very sharp chef’s knife, and a firm, flat board.

  1. Trim the crusts. Cut off all four sides, one at a time, with straight downward sawing strokes. Keep the blade vertical so the sides come out square.
  2. Find the center. Line the knife up across the middle of the cutlet, not the middle of the bread, so both halves show the same amount of pork.
  3. Hold it lightly. Rest your flat hand on top of the sandwich. Pressing hard squeezes the sauce out.
  4. Saw, do not push. Let the serrations do the work in long, gentle strokes. As the blade reaches the bottom slice, ease off and finish with a light stroke rather than sawing into the board. One smooth pass gives a cleaner face than several short, hacking ones.
  5. Wipe between cuts. If you cut into thirds or triangles, wipe the blade with a damp towel before each new cut so sauce does not smear the next face.

Halves show off the cross-section best, and thirds make a neat lunchbox portion. Wikipedia’s entry on the dish describes it served cut into rectangular or triangular pieces, so either shape is at home.

Can you use a serrated bread knife on a bamboo board? explains how to finish each cut without sawing into the board.

The board for the final cut

The last two steps, shredding the cabbage and slicing the sandwich, are where a board earns its place. The WONAMU. bamboo cutting board is 12 by 9 inches, room for two sandwiches side by side and a pile of trimmed crusts, and its perimeter juice groove keeps any drip of sauce at the edge. Wash it with hot soapy water and dry it on edge when you finish.

Save the crusts. Tossed with butter and sugar and toasted, they make a crisp snack.

The short version

Score the fat edge of half-inch pork loin chops, pound them even and trim them to fit the bread. Bread in flour, egg and panko, then fry or bake until the center reaches 145°F and rest 3 minutes.

Shred cabbage into 1/16-inch threads. Butter one slice of milk bread, sauce the other, build, and press the sandwich for 5 minutes. Trim the crusts, line the knife up on the middle of the cutlet and saw through in one smooth pass.

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WONAMU. makes a bamboo cutting board designed for daily prep, 12 × 9 inches, bamboo, with a perimeter juice groove. Available on Amazon.

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