The Fish Sauce Rome Built and the West Forgot

In 2009, archaeologists excavating beneath a Lisbon apartment block uncovered the ruins of a Roman garum factory — its stone tanks, each capable of holding thousands of liters, still dark with fermented residue from nearly two millennia earlier. [S1] Garum factories like it have since been identified across the empire's western flank, from Baelo Claudia in southern Spain to the Tunisian coast, their production complexes running to dozens of tanks per site. [S2]

Garum was Rome's ketchup, its soy sauce, its MSG — and then, for most of the Western world, it simply stopped. [S3] The story of how it vanished, survived in one Campanian fishing village, and quietly infiltrated pantries across the globe is a lesson in how culinary fashion can bury a staple for a millennium while never quite killing it.

The Roman cookbook De Re Coquinaria, attributed to the first-century gourmand Apicius, deploys garum in roughly 350 of its 468 recipes. [S4] It appeared in sauces for wild boar, in wine-based drinks called oenogarum, and in liquamen, a related condiment scholars increasingly treat as interchangeable with garum itself. [S4] The empire ran on the stuff.

What made garum was controlled rot. Whole fish — usually small, oily species like mackerel or anchovies — were packed in salt at roughly a 3:1 ratio and left to ferment in the sun for months. [S5] The amber liquid that resulted, once strained, was packed into amphorae and shipped across the Mediterranean. [S5] The process relied on both halophilic bacteria and the fish's own digestive enzymes, which broke proteins into free glutamate — the same molecule responsible for the savory depth in parmesan, soy sauce, and MSG. [S16]

The operation smelled exactly as you would expect. Roman writers and municipal ordinances document garum production being prohibited within city limits — the stench was considered incompatible with urban life. [S7] Apicius himself, the man whose name adorns the cookbook, was reportedly a wealthy merchant who traded in the condiment he celebrated; ancient sources describe a figure who spent an enormous fortune on food and died in debt. [S8] Like modern industrial food, garum's ubiquity and its production were deliberately kept apart.

The Western Roman Empire's collapse in the fifth century severed the trade networks that made mass garum viable. [S9] Without amphorae moving reliably between Spain, North Africa, and Rome, the condiment faded. Medieval European cooking pivoted toward vinegar and verjuice as its pungent flavor agent. [S10] Garum became a classical curiosity — something Renaissance scholars encountered in Apicius and could not taste.

Except in Cetara, a small fishing village on the Amalfi Coast in Campania. [S11] There, a technique called colatura di alici survived: anchovies layered with sea salt in small chestnut-wood barrels called terzigni, weighted with a stone, and left to drain over roughly four years. [S12] The liquid that seeps out is collected through a hole pierced at the barrel's base — colatura meaning "draining" — and bottled in small glass vials. [S12] Local accounts trace the method to at least the thirteenth century, when monks at a nearby abbey are said to have practiced it. [S11]

Colatura received EU Protected Designation of Origin status in 2020, officially recognizing Cetara as the sole legitimate heir to Rome's defining condiment. [S13] A 100ml bottle retails in specialty stores for roughly $20 to $30, used in drops rather than spoonfuls — the salt concentration is extreme, and a few drops finish a pasta dish with a depth that would take hours of stock reduction to approximate. [S13]

Meanwhile, the Western world had quietly reinvented garum under a different name. Worcestershire sauce, developed in Worcester, England in the 1830s by chemists John Wheeley Lea and William Henry Perrins, lists fermented anchovies as a primary ingredient. [S14] The recipe's precise origin is disputed — the most common account holds that it was adapted from a sauce brought back from Bengal — but its fermented-anchovy base is more Roman in character than South Asian. [S14]

René Redzepi's team at Noma extended the logic further, developing a garum program that fermented not just fish but beef, chicken, shrimp, and insects under controlled conditions, producing deeply savory liquids they documented in their 2020 Noma Guide to Fermentation. [S15] The book's influence moved garum from an academic footnote into professional kitchens on several continents. [S15]

What disappeared with Rome was not a flavor but a direct confidence in how to achieve it. The West spent roughly fifteen centuries reaching the same savory depth by longer routes — aged cheeses, cured meats, long-simmered stocks — before a fishing village on the Amalfi Coast, a Victorian pharmacy, and a Copenhagen tasting-menu restaurant all pointed back at the same amber bottle.