How fish became a seasoning
Garum was made by packing small fish—or fish parts such as guts—with salt and leaving the mixture to ferment. Salt slowed dangerous spoilage, while enzymes in the fish gradually broke down its tissues. The result was a pungent, salty liquid that could be strained off and used in small amounts, much as cooks today use a concentrated sauce to deepen a dish.
Fermentation mattered because it transformed a perishable catch into a durable, intensely flavored product. The sauce added salt and savory depth to foods that might otherwise have tasted plain; it did not need to dominate a dish to change it.
A coastal product with a long journey
Making garum required fish, salt, time, and space, so production was especially practical near the coast. Once prepared, the sauce could be sealed in transport jars and carried by ship or overland. That made it possible for diners far from a fishing shore to use a flavor made from local marine resources elsewhere in the empire.
Its movement depended on ordinary commercial infrastructure: producers needed containers, merchants needed routes and cargo space, and buyers needed a product with enough value to justify shipping. Garum therefore connected coastal food production to kitchens across a wide territory—not as a banquet-only curiosity, but as a traded seasoning.
Why it suited Roman cooking
A little fermented fish sauce could supply both saltiness and a deep, lingering savor, so cooks could use it across different kinds of dishes. Its broad usefulness helped make it a familiar ingredient rather than a novelty reserved for extravagant feasts. The striking part of the Roman banquet, then, was not simply that fish sauce appeared on the table: a preserved coastal catch could carry the taste of the sea deep inland, sealed in a jar.
