In case you are like me and have always wondered what was in garum, the iconic fermented fish oil popular in the ancient Roman world: At last, we have an answer! Archaeologists analyzing DNA in an Iberian garum workshop have discovered ... SARDINES! (Obviously people might have used different fish in other areas, which will be the focus of future studies.)

Cambridge Core

Roman Atlantic garum: DNA confirms sardine use and population continuity in north-western Iberia | Antiquity | Cambridge Core

Roman Atlantic garum: DNA confirms sardine use and population continuity in north-western Iberia - Volume 99 Issue 406