פירוש על עבודה זרה 63:2

The first attempt to understand this term seems to be that it is simply related to the emperor Hadrian. Rashi explains that his troops took it with them when they went on long journeys to battle. It is unclear whether this is connected with what appears below.

R. Dimi explains that Hadrianic earthenware was an ancient way of making instant wine. Sort of like a tea bag for wine.

Roman instant wine was even better than Jewish first quality wine. I guess they were drinking Manischewitz back then as well.