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Fish Sauce Recipe

Safely brew fish sauce using small saltwater fish, crustaceans, or mollusks with this guide.

| May 2019

fish-sauce
Photo by Getty Images/enviromantic

Fish sauce is the mother of all condiments. Most prevalent today in Southeast Asian cuisines, 2,000 years ago it was the favorite condiment of classical Rome. Then and now, fish sauce is a strategy used in coastal areas to turn abundant small marine life into a nutritious, stable, and flavorful food resource. Fish sauce is essentially liquefied fish; the cells of the fish are transformed from solid to liquid state by enzymatic digestive processes described in the scientific literature as autolysis [self-digestion] and hydrolysis [digestion into water]. Reflecting on the fact that this process spontaneously begins in salted fish if not quickly dried, historian H. T. Huang writes that fish sauce “was an invention that was just waiting to happen.”

Use fresh whole small saltwater fish, mollusks, or crustaceans with their viscera (organs). “The enzyme or enzymes responsible for fish protein hydrolysis are chiefly located in the visceral organs,” reports Keith Steinkraus. According to a team of researchers investigating the production of Thai nampla fish sauce in the Journal of Agricultural and Food Chemistry, fish are left at ambient temperatures for 24 to 48 hours prior to salting. “This actually initiates the fermentation process.”

Next, add salt and stir thoroughly to evenly distribute it. Heavy salting is critical to protect the fish from rapid putrefaction and growth of potentially dangerous bacteria, including C. botulinum. Most contemporary styles of fish sauce incorporate salt at a proportion of no less than 25 percent (by weight); some use considerably more. Food historian Sally Grainger notes that ancient Roman recipes for fish sauce used much less salt, approximately 15 percent. She attributes the higher salt levels in modern fish sauce to “fear of dangerous bacteria such as botulism.” However, the International Handbook of Food-borne Pathogens states that 10 percent salt is enough to prevent the risk of botulism in fish in “the aqueous phase” at room temperature.



Typically no water is added to fish sauce. Salted fish are placed in a crock, barrel, tank, or other vessel, and weighted down — as is sauerkraut — to expel air pockets and keep solids from floating to the top. Initially, salt pulls water from the fish cells by the process of osmosis; then enzyme and microbial processes cause hydrolysis. Depending upon temperature, salt content, and tradition, fish sauces ferment for between 6 and 18 months, with periodic stirring. The recipe I followed, for a Filipino-style fish sauce called patis, sent to me by my friend Julian (whose mother was from the Philippines), instructed to ferment in a warm place until a “desirable aroma has developed.” The color also darkens as time passes, as more of the fish solids liquefy. I left mine to ferment for about six months. It tasted like fish sauce, though I cannot claim to be a connoisseur with a discerning palate. Keith Steinkraus reports on patis production that the fermentation time ranges from six months to a year.

In the Filipino tradition, the fish sauce is drained from the solids. The liquid sauce is patis; the residual solids, with remaining bones removed, are ground into a paste called bagoong, also used as a condiment. Fish sauce may be used raw after straining or is often pasteurized before bottling, sometimes with the addition of alcohol.






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