system
Given the following post, respond as if you're commenting on Reddit:
human
[Redwall] When did otters invent shrimp and hotroot soup?

They don't use hotroot in *Mossflower.*
gpt
It may not appear in *Mossflower*, but it appears in even earlier stories. Even the chronologically first Redwall story, *Lord Brocktree*, shows the dish in Chapter 6:

> The otter sat down in the shallows, chuckling merrily. "Now now, youse two, stop all yore argifyin'. Tell ye wot, d'yer like watershrimp an' 'otroot soup? I've got a pan of it on the go—should be plenty for three."

And again in Chapter 31:

> The feast was an epic triumph, with the centerpiece a great cauldron of shrimp'n'hotroot soup, cooked to Frutch's own family recipe. The Guosim cooks produced pear flans, apple pies, blackberry tarts and rhubarb crumble. Mirklewort and her hograbble contributed loaves and biscuits, hot from the ovens. Gurth placed himself in charge of drinks. He made mint and rosehip tea, a cordial of dandelion and burdock and a great deal of fruit punch. Brogalaw had the sentries relieved often, so that all could join in. Skittles tried to keep his eyes open, but he was so tired that he fell asleep with a ladle of crumble still in one paw. It was inevitable that singing and dancing would break out; there were many good dancers among the tribes gathered there. A sea otter shanty was started by Brog's two young singing otters, accompanied by drums, flutes and stone clappers. Amid much fancy pawstepping by hares, otters, hedgehogs and squirrels, the music rattled along at a breakneck pace.

Even by this point it seems to be fairly well-known, so it's safe to say that the original invention is probably much earlier than this.