Japanese Curry Rice

Variations

• Katsu curry: Top with a pork cutlet (see the tonkatsu recipe).
• Chicken/seafood: Use chicken, or shrimp and squid, instead of meat.
• Vegetable curry: Skip the meat for lots of mushroom, eggplant, and squash.
• Curry udon/donburi: Turn leftovers into curry udon or a rice bowl.

Tips

• Off the heat, because a solid roux block behaves exactly like dry powder. Thickening says that tipping dry starch into hot sauce gelatinises the outside first, sealing dry powder inside a lump. A commercial curry block is roux already cooked and set solid, and dropped into a boiling pot its surface gelatinises on the spot and seals the inside. Same mechanism; the only difference is a block instead of a powder.
• There is a second reason the roux goes in last. Pasta e fagioli states it: "heat does not move through a thick broth the way it moves through water." So the potato and carrot are cooked tender before anything thickens. Reverse the order and convection stops, the potato cooks unevenly in a thick liquid, and the base catches.
• The 5-10 minutes after it dissolves is not a formality. Starch swells and sets as it takes up water between 60 and 75°C — cheung fun turns on the same number. Never reach and hold that and the roux has only melted, not thickened.
• You do not fix the consistency by adding more roux. The guide's roux ladder says the longer it cooks the deeper the colour and the weaker its thickening power, and in a bought block that trade is already fixed at purchase — so it cannot be adjusted the way a roux made in the pan can. Which is why the guide's "too little is fixable by adding more; too much is not" bites hardest here. Water to loosen, more simmering to tighten.
• The onions' sweetness is caramelisation. Browning separates the two: caramelisation breaks down sugar alone (sugar, onion, carrot), while Maillard needs sugar and protein together. The difference here is that these onions are then boiled. In French onion soup the caramelised onion is the dish; in curry it is a sweetness deposited into the liquid.
• Brown the onions deeply for that rich sweetness — don't rush it.
• Always dissolve the roux off the heat so it doesn't clump.
• Grated apple, honey, and butter make boxed roux taste homemade.
• It's even better the next day — a great make-ahead dish.
• Too thick? Add water. Too thin? Simmer a bit longer.