How to Cook Fish Scale Jelly: A Foolproof Home Method

Fish scale jelly is a traditional wellness dessert passed down through generations of Malaysian Chinese families — dried fish scales are simmered slowly, then chilled until they set into a smooth, springy jelly rich in natural collagen. First-timers usually hit two problems: a fishy smell, or a jelly that never sets. Both are avoidable if you remember three rules — right water ratio, enough heat, and never add water midway.

What do you need?

500 g dried fish scales (we recommend Halal-certified, lab-tested ocharves deep-sea dried fish scales, 100% guaranteed to set)
3 litres of water (only 2 litres if using a sealed pressure cooker — see the table below)
Coarse salt + white vinegar (for washing)
Flavourings of your choice: rock sugar, red dates, goji berries, pandan leaves, roselle, monk fruit and so on

The single most important rule: decide the amount of water before you start cooking, and never add water midway or after cooking. Extra water dilutes the collagen and the jelly will not set in the fridge.

Step 1: How to wash dried fish scales

1Put the dried scales in a large basin, cover with water, and add coarse salt and white vinegar.
2Soak for about 30 minutes — the vinegar's acidity removes impurities and residual protein, while the coarse salt scrubs and cleans by osmosis.
3Rinse thoroughly with clean water. No further soaking needed — the scales can go straight into the pot.

The vinegar and salt are only cleaning agents — once rinsed off, they have no effect on the taste.

Step 2: How to simmer (water and time for three types of pot)

Cooking method	Water per 500 g of scales	Time
Stove	3 litres	At least 2 hours, at most 3.5 hours
Slow cooker	3 litres	Pre-boil hard on the stove for 15 minutes first, then transfer and simmer 2–2.5 hours
Pressure cooker (valve closed/sealed)	2 litres	45–50 minutes
Pressure cooker (valve open)	3 litres	About 2.5 hours

Stove: bring to a rolling boil, then lower the heat and keep the pot at 80°C or above throughout. The water naturally reduces by about 30–40% as it cooks — this is normal, do not top it up.

Slow cooker: you must first boil hard on the stove for at least 15 minutes before transferring — a slow cooker heats up too slowly, and starting from cold water never gets hot enough to draw the collagen out.

Pressure cooker: heats fast enough that it is the only pot that needs no pre-boil. Note that a sealed cooker loses no water to evaporation, which is why it takes only 2 litres.

For a Nyonya-style aroma, drop in a few knotted pandan leaves while simmering — it adds fragrance and further masks any fishiness (optional).

Step 3: How do you know it worked?

Three signs — all verifiable with your own eyes and hands, no instruments needed:

1The scales curl — during cooking the scales slowly curl up.
2The broth turns thick and sticky — a spoonful is visibly thicker than water, and a fingertip dipped in feels distinctly tacky.
3It sets after chilling — bottle it, refrigerate overnight, and by morning it has turned into jelly.

The broth will not turn noticeably white. Judge by thickness and stickiness, not colour.

Step 4: How to bottle and set

1Strain out the spent scales and pour the broth into glass jars (ones with sealing lids are best). This is when you can add cooked red dates, goji berries or other ingredients to taste.
2Rest each lid loosely on its jar without tightening — heat can escape while dust is kept out.
3Let the jars cool at room temperature for about 30 minutes, then tighten the lids.
4Refrigerate on the main shelf (middle or upper), leaving space between jars. Avoid the door compartments — they run warmer and the jelly may not set there.
5Chill overnight and check the set the next morning.

Frequently asked questions

Why didn't my fish scale jelly set?+

The three most common causes: too much water (the ratio was off and the collagen got diluted), not enough heat (the pot didn't stay above 80°C throughout — especially slow cookers used without the stove pre-boil), and not enough time (the collagen hadn't fully released). The scales themselves also need enough collagen — ocharves deep-sea dried fish scales are graded and lab-tested, and 100% guaranteed to set.

My jelly set soft — is that a failure?+

No. Firmness depends on the water amount, cooking time and fridge temperature. Soft-set and firm-set are both successes — what matters is that it set at all, not how hard it is.

How long does fish scale jelly keep?+

2–4 weeks refrigerated, depending on your fridge. It must stay refrigerated at all times — never leave it out at room temperature for long, and discard it if it smells or looks off.

There's a lot of foam when I wash the pot — is that chemical residue?+

No. The foam is the natural reaction of leftover collagen protein meeting water — the same thing happens when you wash a bone-broth or fish-soup pot. More foam actually means your pot extracted more collagen.

Is fish scale jelly Halal?+

Fish is inherently a Halal ingredient. ocharves dried fish scales carry JAKIM Halal certification and MeSTI food-safety certification, with lab reports published on the safety reports page — Muslim friends can enjoy it with confidence.

How much should I buy at a time?+

First-timers should start with the 500 g pack (exactly one standard pot); households that cook it often get better value from the 1 kg pack, with free West Malaysia shipping over RM60.

ocharves (Ocean Harvester Ventures Sdn Bhd) is a Malaysian brand from Penang specialising in Halal-certified, lab-tested deep-sea dried fish scale collagen. See the full FAQ for more details.