两千三百年前的粽子，从两座楚墓里挖了出来。一批素的，一批有肉——荤素之争比屈原还老。

Start with something almost every Chinese child has heard.

A very long time ago in the state of Chu there was a man called Qu Yuan, and he threw himself into a river.

People by the river feared the fish would bite his body, so they wrapped rice in leaves and threw it into the water to feed them.

And so every Duanwu, we eat zongzi.

This story has been told so many times that nobody asks it anything any more.

This year, archaeologists asked on our behalf.

And they did not ask "is this legend true or false" — asked that way, you never get an answer.

They asked something checkable: which appeared first, zongzi or Qu Yuan?

The evidence comes from two tombs, both of the state of Chu.

The first is tomb 8 at the Chengyang city site in Xinyang, Henan, cleared in 2015.

In the rear chamber, stacked in neat rows, were forty "plant packages" — leaves wrapped around something, tied shut.

The second is Wuwangdun tomb 1 in Huainan, Anhui, excavated in 2024.

It is the largest and highest-ranking Chu tomb scientifically excavated to date; the occupant is King Xiong Yuan of Chu.

In its eastern chamber, more than two hundred of the same "plant packages".

The two tombs are about a century apart, and both used these as grave goods.

What comes next is where the research gets genuinely hard.

First question: what kind of leaf is this?

A leaf that has lain underground for two thousand three hundred years is long past being identified by its shape.

The team extracted ancient DNA from it, reconstructed the chloroplast phylogeny, and compared that against living tree species.

The answer is oak.

Oak leaves are broad and thick, with edges that curl slightly — a natural wrapping material.

Second question: what is wrapped inside?

The Xinyang batch: unhusked millet and rice.

Those two words, "unhusked", are the key.

Grain still in its husk cannot be eaten directly by a person.

So it was never food for the living. From the beginning it was an offering.

The Huainan batch is a different matter entirely.

In the residue, researchers detected palmitic and stearic acid — the signature of animal fat.

Translated into plain speech: there was meat in that package.

Which leaves us with a conclusion it is hard not to laugh at.

Two thousand three hundred years ago, zongzi had already divided into meat and vegetarian.

The war that breaks out on the Chinese internet on schedule every year — whether meat belongs in a zongzi — turns out to be a war two thousand three hundred years old, and we now have the physical evidence.

Now back to which came first.

Xinyang tomb 8 dates to roughly 339 to 329 BC, the early reign of King Wei of Chu.

By the usual reckoning, that is right around when Qu Yuan was born.

Qu Yuan went into the river in 278 BC — sixty years later.

And the earliest text that formally puts zongzi and Qu Yuan together is the Southern Dynasties Xu Qi Xie Ji — later than the Xinyang objects by more than seven hundred years.

Line those three points up and the order is unmistakable.

First the food — and from the moment it appears, it is an offering.

Sixty years later, the man who went into the river.

Seven hundred years after that, someone joined the two and gave it a reason.

To be clear: this is not debunking the legend.

What a legend does is not record. It houses.

An old habit with no traceable origin is sitting there; people need a reason they can tell a child; so the legend gets written, and takes it in.

Qu Yuan is a good enough reason — a loyal minister, a river, a crowd who could not bear it.

Once the reason holds, the action has meaning, and the habit can run another thousand years.

A great many Chinese customs grow this way: first the action, and only much later the explanation.

One last detail, and it stopped me more than any of the data did.

Around Ruzhou in Henan today, there are still people who wrap zongzi in oak leaves.

Set an oak-leaf zongzi wrapped by someone in Ruzhou this Duanwu beside the one lifted out of the Wuwangdun tomb, and they are almost the same object — the same leaf, the same fold, the same shape.

Two thousand three hundred years lie between them.

Qin, Han, Tang, Song, Yuan, Ming, Qing.

Two thousand three hundred years ago, someone laid a parcel of oak-wrapped grain in the burial chamber of a king of Chu.

Two thousand three hundred years later, someone in their own kitchen used the same leaf to wrap one almost identical to it.

There were no instructions in between, and not one person along the way knew what they were continuing.

It was simply handed from one pair of hands to the next, all the way to today.

Think about it: is there anything in your family that gets done every year, that nobody can explain?