In brief
Among the hundreds of regional wagyu brands in Japan, one is scarcer than all the famous names — scarcer than Kobe, than Matsusaka, than Omi. It comes from a single small island, it is fed on what used to be a waste product, and there are only around 1,700 of the animals alive at any time. This is Sanuki Olive Wagyu.
The story begins on Shodoshima, an island in the Seto Inland Sea in Kagawa Prefecture that produces the overwhelming majority of Japan’s olives. Pressing olives for oil leaves behind a pulp — the lees — and for years it was simply discarded.
A local cattle farmer, Masaki Ishii, saw the waste and wondered whether it could be feed. Cattle would not touch the raw, bitter pulp, so he developed a slow process of drying and roasting the pressed olives until they turned sweet and palatable. After years of trial, olive-fed wagyu was established as a brand around 2010. An island by-product had become the base of a world-class beef.
Olive lees are rich in oleic acid — the same monounsaturated fat that makes olive oil prized. Producers say finishing cattle on the roasted lees raises the oleic-acid content of the animal’s fat, which is associated with a softer texture, a lower melting point and a cleaner finish on the palate. Olive wagyu consistently grades in the top A3 to A5 band, and has collected national awards well out of proportion to its tiny output.
It is worth being precise about the claim: the distinctive input is the feed, not a separate breed. Olive wagyu is Japanese Black — the same breed behind most Japanese wagyu — raised conventionally and then finished on olive lees. The bloodline is ordinary wagyu; the feed is what makes it Sanuki Olive Wagyu.
There is a quiet irony in that. The quality olive wagyu is prized for — the composition of the fat, and how lightly it melts — is not something Japan’s grading system measures at all. Oleic acid content and melting point appear nowhere in the grade, which is why the case for olive wagyu has to be made in words rather than read off a label. We explain what the grades do and do not capture in What Is A5 Wagyu?
Rarity here is not a marketing choice; it is built into the supply chain. The herd is around 1,700 head — against nearly 16,000 for a single mainstream brand such as Miyazaki — raised by a small group of farmers in one prefecture.
More fundamentally, the feed is capped by the olives. You can only make as much olive lees as the island presses oil, so the amount of olive wagyu that can ever be produced is tied to a modest, fixed agricultural output. Unlike a brand that can expand by adding barns, olive wagyu runs into a hard ceiling set by the olive harvest. That is why it stays rare, and why it rarely appears outside Japan.
Olive wagyu is a good reminder that “wagyu” is not one thing. Within Japan’s four native breeds sit hundreds of regional brands, distinguished by where and how the cattle are raised — and occasionally, as here, by a single unusual ingredient. What unites the serious ones is the same verifiable grading system that underpins every Japanese carcass. We explain how that grading works, and what its scores measure, in The Standard.
Where we’d actually send you to eat. Our committee dines unannounced, pays its own way, and takes no money from any restaurant. See the selection of Japan’s best wagyu and yakiniku restaurants.