Garum

Garum is a fermented fish sauce that was used as a condiment in the cuisines of Phoenicia, ancient Greece, Rome, Carthage, and later Byzantium. Liquamen is a similar preparation, and at times they were synonymous. Although garum enjoyed its greatest popularity in the Western Mediterranean and the Roman world, it was in earlier use by the Greeks. The taste of garum is thought to have been comparabl... (Wikipedia)