It was most closely related to switchel, an acid summer drink people used to drink before they had lemons to make lemonade.

Posca, the Roman vinegar-based wonder-drink, is a bit of a mystery, because as much as people keep mentioning it, it is oddly absent from ancient literature. Posca appears in books and articles, being sipped by soldiers and passed around by pals, yet we don't even have a recipe for it!

Basically, we know that soldiers were given a vinegar ration (Vegetius, Concerning Military Matters, 3.3), and that this vinegar could be mixed with water and drunk. (Celsus, On Medicine, 2.27) Hadrian drank posca to 'be one of the soldiers' (Historia Augusta: Hadrian, 10.2), and from this we can infer that it wasn't a drink usually served to the rich. On the contrary, this was a drink sold on the streets! (Suetonius, Vitellius, 12.1) If you think about it, this makes a lot of sense - vinegar is what is left when wine production goes 'wrong', or if wine is left exposed for too long. Knowing how much wine the Romans got through, it stands to reason that there was a lot of vinegar knocking about - so, why not put it to use?

Clearly posca was good enough to keep a Roman army marching - in his soldiering days, Cato the Elder drank posca to fend off raging thirst. (Plutarch, Cato the Elder, 1.10). The sharpness of the vinegar masked the taste of questionable water, the acidity would have helped to kill off certain bacteria, and, according to a recent study, vinegar makes you feel more full after eating bread. We shouldn't rush to say that the Romans knew all of this, but it is important nonetheless. What wasn't so important to the Romans was writing the recipe down, which leaves us in a bit of a pickle.

and possibly have helped hasten the end of a case of clap.

It's strange that we don't know what was in posca but we do know what was in garum. I guess when the first lemons came in, it was "Yay! We don't have to drink vinegar any more!" and posca was lost forever. My best guess says it was sweetened with something, either fruit juice or honey, since it had a name. Or it might have been slightly alcoholic, we just don't really know.

I love the sort of forensic archaeology that seeks to duplicate things from a long time ago, whether buildings, technology, or food.

Also available as Resurrection Rolls. https://sofestive.com/2017/03/10/easter-recipe-resurrection-rolls/

page I was trying to find. It looks like the one, anyway.

The photos make my mouth water! Yum!

Wow!