Steamed Clam Broth (Strained) | IDDSI Level 3 Recipe

IDDSI Level 3 (Liquidised) | 20 minutes | Easy

Steamed clam broth (蜆肉清湯) is a pure, mineral-rich seafood broth made by steaming fresh clams just long enough to open them and release their natural liquor. The broth — a combination of the natural clam juices and a small amount of added liquid — is then strained through a very fine mesh to remove all solids, shell fragments and particles. The result is a completely clear, intensely flavoured, flowing liquid that meets IDDSI Level 3 (Liquidised): it flows freely and continuously, has zero solid particles, and requires no modification. This is one of the purest and most nutritionally dense Level 3 options available — a single serving provides significant amounts of zinc, iron, B12 and iodine. The broth can also serve as a highly flavourful base for other Level 3 preparations.

Ingredients (3–4 servings)

Main:

• 500g fresh Manila clams or Surf clams (蜆/蛤蜊), purged
• 150ml cold water or light broth

Aromatics:

• 3 slices fresh ginger
• 1 spring onion
• 1 tablespoon Shaoxing wine (optional)

Seasoning:

• Salt (to taste — clams are naturally salty, very little additional salt needed)
• White pepper, a pinch
• 1/2 teaspoon sesame oil

Method

1. Purge the clams: Place clams in salted cold water (1 tablespoon salt per 500ml water) for 30 minutes to expel sand and grit. Rinse thoroughly under cold running water.
2. Discard any clams that are already open and do not close when tapped — these are dead.
3. Place clams in a pot with cold water or light broth, ginger slices, spring onion and Shaoxing wine.
4. Cover tightly. Steam or bring to a boil over medium-high heat for 4–5 minutes until all clams have opened.
5. Remove from heat immediately — do not continue cooking as the broth will become cloudy and the flavour will degrade.
6. Strain carefully: Ladle the broth through a very fine mesh sieve lined with a clean paper towel or muslin cloth into a clean pot. This removes all shell fragments, grit, sand and clam particles.
7. Discard all solids (the clam shells and clam meat are not used in this preparation — the broth alone is served).
8. Return to gentle heat. Season carefully with salt (clam broth is naturally salty — taste first), white pepper and sesame oil.
9. Serve in a cup or bowl — the broth should be clear to lightly amber, smooth and completely free of particles.

Texture Test

Level 3 flow test: The strained broth flows freely and instantly through fork tines; it is completely clear with zero particles or fibres; it is thinner than congee but has a natural slight viscosity from minerals; it flows like water but with more flavour body.

Clarity check: Hold a cup of the finished broth up to light — it should be clear or lightly golden, with no visible particles or cloudiness. Any cloudiness indicates inadequate straining — pass through the fine sieve again.

Safety Notes

⚠️ Shell fragments — even small shell fragments are extremely sharp. Double-straining through paper towel or muslin is mandatory. This is not optional for dysphagia service.

⚠️ Shellfish allergy — clams are shellfish; always check resident allergy records.

⚠️ Sand and grit — inadequate purging leaves grit in the broth. Always purge clams for at least 30 minutes before cooking.

⚠️ Freshness — use only live clams (shells closed or closing when tapped). Dead clams can contain harmful bacteria.

⚠️ Sodium — clam broth is naturally high in sodium. For residents on low-sodium diets, dilute with additional unsalted water and do not add extra salt.

Sourcing Outside Hong Kong

For international care kitchens and home cooks outside Hong Kong, Cantonese ingredients are widely available at East and Southeast Asian grocery stores:

• United Kingdom: Wing Yip (Birmingham, London, Manchester), See Woo (London), Loon Fung (London)
• United States: 99 Ranch Market (West Coast), H Mart (East Coast), local Chinatown grocers
• Canada: T&T Supermarket (national chain), local Asian markets
• Australia: Burlington Supermarket, Tang’s, local Chinese grocers in Chinatown precincts
• Singapore & Malaysia: Sheng Siong, NTUC FairPrice (Singapore); Tesco, Mydin (Malaysia)
• Online: Sous Chef (UK/EU), Amazon.com (US), Yami.com (US)

Fresh or canned clams: mainstream supermarkets. Fresh clams at East Asian fishmongers; canned baby clams at Wing Yip, H Mart, T&T.

If a specific ingredient is unavailable in your region, the recipe notes alternative substitutions in the Ingredients section. For dishes requiring fresh Cantonese-specific ingredients (e.g. preserved century egg, fresh rice noodle rolls), check with your local East Asian grocer before substituting — texture compliance for IDDSI levels may require specific products.

Nutrition

Approximately 60 kcal per serving (about 200ml), 8g protein, 1g fat. Clam broth is extraordinarily mineral-dense for its caloric content: significant zinc (immune function), iron, B12, iodine, selenium and potassium. Excellent hydration vehicle. The broth can be enriched with protein powder or neutral thickener without significantly altering flavour.

Cultural Note

In Cantonese and Hong Kong home cooking, clam broth (蜆湯) is a traditional restorative — grandmothers make it for family members recovering from illness or for those who need to “cool the liver fire” (清肝熱) according to traditional Chinese medicine. The pure, clean flavour and mineral richness make it a deeply familiar and comforting preparation for elderly Hong Kong residents, associated with care, recovery and nurturing.