Artemia Fish Sauce Recipe

Prepare fermenting mixture

In a large nonreactive bowl or measuring container, combine 1 cup dried Artemia biomass/powder with 0.25 cup coarse sea salt. Add 700 ml distilled water and stir vigorously until salt begins to dissolve and Artemia is suspended. Mixture will look cloudy. If using pre-fermented Artemia powder, gently rehydrate by folding and letting sit 20–30 minutes.

Pack into fermentation vessel

Transfer the Artemia-salt slurry into a clean glass jar, leaving about 3–4 cm (1–1.5 in) headspace. Press the solids down so they are submerged beneath the brine. Wipe rim clean and seal with a lid that allows very slight gas escape (an airlock is ideal; if not available, seal but open briefly once daily).

Ferment

Place jar in a cool, dark place at 18–25°C (65–77°F). Fermentation for traditional fish sauce analog takes time: allow 6–12 weeks. Check weekly: press solids to keep submerged, release gas if sealed tightly, and skim any unwanted scum. The mixture will gradually turn brown and develop a strong umami aroma.

Prepare flavoring

After the fermentation period (minimum 6 weeks, preferable 8–12 weeks for depth), open the jar. Stir in 0.25 cup thinly sliced shallot and 2 tsp crushed garlic into the fermented mixture. Add 1 tbsp palm sugar, 1 tbsp white rice vinegar and 1 tbsp fresh lime juice to balance saltiness and help stabilize flavor. Add the optional whole dried chili if you want gentle heat. Stir to dissolve sugar.

Extract liquid

Line a fine-mesh sieve with cheesecloth (two layers) over a mixing bowl. Pour the fermented mixture through the cloth and let it drip by gravity for 1–2 hours. Do not press; pressing forces fine solids into the liquid and makes it cloudy. Collect the dark amber liquid — this is the Artemia fish sauce. If yield is low, you may gently press the solids for a second, darker extraction (optional).

Clarify and adjust

Taste the drained liquid. If too salty or intense, add up to 100 ml filtered water to dilute to taste. If flat, dissolve a little extra palm sugar (up to 1 tsp) or a few drops more lime juice. Strain again through fresh cheesecloth if any particulates remain.

Bottle and age briefly

Transfer the clarified fish sauce into a clean glass bottle or jar, leaving a small headspace. Seal tightly and let it rest 1–2 weeks at room temperature for flavors to marry. Refrigerate after opening. The sauce will keep refrigerated for several months; if any off-smells or visible spoilage appear, discard.

Usage

Use Artemia fish sauce as you would nam pla: as a seasoning for soups, dipping sauces, dressings, and marinades. Start with 1–2 teaspoons and adjust to taste because of concentrated umami and salt.