Katsu Curry Yoshoku Breaded Cutlet Sauce Japan

Ingredients

• For the Japanese curry sauce
• 2 tbsp neutral oil or unsalted butter
• 2 large onions, finely sliced
• 2 medium carrots, cut into bite-sized pieces
• 2 medium waxy potatoes, peeled, cut into bite-sized pieces
• 600 ml water or dashi
• 1 medium apple, peeled and grated
• 200 g Japanese curry roux blocks, such as S&B Golden Curry or Vermont Curry, roughly broken
• For the katsu
• 4 pork loin or chicken breast cutlets, approximately 150 g each, pounded to even thickness
• 60 g plain flour
• 2 eggs, beaten
• 120 g panko breadcrumbs, pressed firmly onto cutlet
• 1 litre neutral frying oil, for deep-frying at 170 °C
• To serve
• 800 g cooked Japanese short-grain rice, hot
• 80 g fukujinzuke, Japanese pickled daikon relish
• 2 tbsp tonkatsu sauce, drizzled over, optional

Method

1. 1
   Heat the oil or butter in a heavy-based saucepan over medium-low heat. Add the sliced onions and cook, stirring regularly, for a minimum of 30 minutes until deeply caramelised and reduced to a mahogany-coloured mass. The onions are ready when they offer almost no resistance and carry a rich, sweet, roasted smell.
2. 2
   Add the carrots and potatoes to the pot, stir to combine with the onions, then pour in the water or dashi. Bring to a simmer and cook, partially covered, until the vegetables are just tender — a skewer should pass through a carrot piece with slight resistance.
3. 3
   Remove the pot from the heat. Add the grated apple and the broken curry roux blocks. Stir steadily until every block has dissolved completely into the liquid, producing a smooth, thick, glossy sauce. Return to low heat and simmer for 10 minutes, stirring frequently. This is where the dish lives or dies: the sauce must be thick enough to mound on rice without running — it should coat the back of a spoon heavily and fall in slow, ribbon-like sheets, not pour. A thin, watery sauce is the defining failure of the dish.
4. 4
   Set up a three-stage breading station: plain flour, beaten egg, and panko. Season the cutlets, dust in flour, pass through the egg, then press firmly into the panko so the crumbs adhere in a compact, even layer. The coating should feel dry and sturdy to the touch, with no bare patches.
5. 5
   Heat the frying oil in a deep pan or wok to 170 °C. Lower the breaded cutlets in carefully and fry, turning once, until the panko is uniformly golden and the internal juices run clear — approximately 4–5 minutes for pork, 4 minutes for chicken. Drain on a rack, never paper, to preserve the underside crust. The coating should be audibly crisp when tapped with tongs.
6. 6
   Slice each cutlet crosswise into 2 cm strips immediately before plating. Mound hot rice to one side of a deep plate or bowl. Ladle the curry sauce generously over the rice, then lay the sliced katsu beside or atop the sauced rice. Place a portion of fukujinzuke to the side. Drizzle tonkatsu sauce over the katsu if using. Serve at once — the crunch is a property of freshness only.