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1
Combine all five sauce components in a small bowl (Bulldog : ketchup : soy : apple juice : Worcestershire, 4:2:1:1:1) and stir until uniform. Set aside. The sauce is ready when it reads as a single tangy-sweet-savoury note with no individual component dominant — taste to confirm.
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2
Pat the pork cutlets dry. Score the sinew at 15 mm intervals along the edge to prevent curling. Dredge each cutlet in flour, shaking off the excess; pass through beaten egg; press firmly into panko, ensuring an even, unbroken coat. The coating is ready when no bare pork is visible and the panko clings without slipping.
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3
Heat the oil to 170°C in a deep, heavy pan — a wooden chopstick held in the oil should produce a steady stream of small bubbles. Lower one cutlet at a time into the oil and fry for 4–5 minutes, turning once, until the exterior is an even, deep golden amber. Remove to a wire rack. The cutlet is done when it sounds hollow and dry when tapped lightly with tongs.
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4
This is where the dish lives or dies: rest the fried cutlet on a wire rack — never flat on paper — for 2–3 minutes before cutting. Cutting too early releases trapped steam directly into the panko crust, collapsing its structure irreversibly. The crust is ready to cut when it no longer steams visibly and remains rigid when pressed lightly with a fingertip.
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5
Apply a thin line of yellow mustard to one face of each base bread slice. Spread the house tonkatsu sauce generously across both inner faces of every bread pair — on the bread, not on the cutlet. Sauce application must be immediate: the acid in the sauce begins softening the crumb within 15 minutes, so the sequence is sauce → assemble → cut → serve without pause. The bread face is ready when the sauce covers edge to edge with no dry patches.
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6
Place the rested cutlet on the sauced base bread. Press the top slice firmly down with a flat palm to compress the sandwich into a cohesive block. Using a sharp, heavy knife in a single downward stroke — no sawing — remove all four crusts cleanly, then cut the sandwich on the diagonal. The cut is correct when the cross-section shows a clean geometry: gold panko, white bread, and the meat interior in distinct, unblurred layers.
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7
Stand each piece on its cut edge to expose the interior. Serve immediately on white paper. The sandwich is at its peak when the panko crust is audibly crisp on the first bite and the bread retains its pillowy structure without any sogginess on the bottom surface.