Japanese curry, that thick, savory-sweet sauce over rice, almost always starts from a boxed roux block, and nearly every one of those blocks is a conglomerate product padded with palm oil, MSG, and additives. This is a thin shelf on purpose: the one independent worth naming makes the roux from scratch instead, out of real, single-origin spices.
Published July 2026 · Updated 7 Jul 2026
Cookbook author and teacher Sonoko Sakai makes a Curry Brick Kit of pre-measured whole and ground spices (17 of them, including single-origin turmeric) that you toast and blend into a from-scratch Japanese curry roux at home, plus a ready-made curry powder. It's the antidote to the boxed block: you control the fat, skip the additives, and get a fresher, more fragrant curry. Ships nationwide from her LA kitchen.
Why it isn't on AmazonA from-scratch spice kit for Japanese curry is a teacher's project, not a factory brick; the whole point is real spices and no palm oil or MSG, which no boxed roux on the shelf can say.
See it at Sonoko Sakai →This seat's open on purpose — we won't pad the list to hit a number. If you ship real japanese curry roux direct, it's earned, not sold.
Add your brand →It's a solid block of fat, flour, and curry spices that you dissolve into a pot of simmered meat and vegetables to make Japanese-style curry, which is thicker, milder, and a bit sweeter than Indian or Thai curry. The boxed blocks are convenient, but most are built on palm oil with flavor enhancers and additives. Making the roux from scratch means fresher spice and cleaner ingredients.
Japanese curry is thick and gravy-like, mildly sweet, and comparatively gentle on spice heat, usually served over rice with potatoes, carrots, and onions or as katsu curry. It came to Japan via the British navy in the Meiji era, which is why it's flour-thickened like a Western stew rather than built on a fresh spice paste or coconut milk like Thai curry.
Absolutely, and it's the same idea as any roux: toast a spice blend (turmeric, coriander, cumin, fenugreek and friends), cook it into a butter-and-flour roux, and stir that into your simmering pot. A pre-measured spice kit takes the guesswork out. You get to control the fat and salt and skip the additives in most commercial blocks.
It's usually mild to medium; the flavor is more warm and savory-sweet than fiery. Making it from scratch lets you dial the heat with more or less cayenne or chili, and round it out the traditional way with grated apple, a little honey, or a square of chocolate for depth. Boxed blocks come in fixed 'mild/medium/hot' grades you can't really change.
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