Vietnamese Steamed Clams with Lemongrass, Ngheu Hap Sa
Ngheu hap xa is Vietnam's beloved steamed-clam dish: fresh clams steamed just until they open in a fragrant broth of bruised lemongrass, ginger, garlic and chilli, finished with fish sauce and lime. The clams release their own briny juices into the broth, and the dish is served with a sharp chilli-lime dipping sauce. One serving is about 320 g.
Steaming shellfish with lemongrass — hap xa — is one of the oldest tricks in Vietnamese coastal cooking: the fragrant stalks perfume the steam, tame any fishiness and turn a handful of clams into a dish worth gathering around. Versions appear all along the coast, from Hanoi's beer-steamed clams to the southern style with Thai basil, and the dish is a fixture of Vietnamese beer halls and family seafood dinners alike. The rule never changes: fresh clams, fierce steam, and pull them out the second they open.
Pairs well with: Chilli-lime fish sauce dip, fresh herbs, steamed rice or cold beer
Provenance
Vietnam
Coastal Vietnam Classic
East & South Asia
Time Dedication
45m
35m prep • 10m cook
Batch Yield
4 Servings
166 kcal per serving
1 serving ≈ 320 g
Technical Skill
Easy
Easy (One Pot)
Meal Timing & Digestive Fit
Breakfast
Not Advised
Lunch
Hearty Midday Main
Dinner
Ideal Hearty Main
Snack & Tea
Inappropriate
Coastal Vietnam Classic
Photo: Jon Sullivan, Public domain, via Wikimedia Commons
The Heritage Formulary
Estimated cost: Low — about $3–4 per serving at home (USD)
A good ngheu hap xa is judged by the clams themselves: plump, glossy and just opened, swimming in a broth that smells of lemongrass before you taste it — never rubbery, never sandy.
Execution Methodology & Culinary Technique
Prep Stage: Soak, Scrub & Bruise
35 Mins • Soaking
Soak the clams in salted cold water for 30 minutes so they spit out their sand, then scrub each shell clean. Meanwhile bruise the lemongrass, slice the ginger and garlic, and mix the little dipping sauce from fish sauce, lime juice, sugar and chilli.
Maestro Tip: Never skip the soak — a single sandy clam can grit up the whole bowl. Change the water once halfway through.
30 Mins • Soaking Cold water, about 10°C (50°F)
Put the clams in a large bowl of cold water with a tablespoon of salt and leave for 30 minutes so they filter out sand. Drain, change the water once, then scrub each shell with a brush and rinse well. Discard any clam that stays open when tapped, and any with a cracked shell.
Tap-test every clam: a live clam closes when tapped. Open ones are dead and must go.
Done when: Clams are clean, closed and smell fresh of the sea; the soaking water is gritty.
5 Mins • Knife Work Room temperature, about 20°C (68°F)
Trim and bruise the lemongrass, slice the ginger and garlic, and slice the chilli. For the dipping sauce, stir together the reserved 15 ml of fish sauce, half the lime juice, half the sugar and half the sliced chilli in a small bowl. Scatter the herbs on a plate, ready to serve.
Bruising the lemongrass — not just cutting it — is what releases its citrus oils into the steam.
Done when: Lemongrass is flattened and fragrant; the dip tastes salty, sour, sweet and hot in balance.
3 Mins • Steaming Boiling water, 100°C (212°F)
Put the lemongrass, ginger and garlic in a large pot with the 240 ml of water and bring to a rolling boil. Cover and steam the aromatics for 3 minutes so the water turns fragrant before the clams go in.
Starting with the aromatics alone means the first steam the clams meet is already perfumed.
Done when: The steam smells strongly of lemongrass and ginger.
5–7 Mins • Steaming Boiling, 100°C (212°F)
Add the clams to the pot with the remaining 15 ml of fish sauce and the rest of the sugar. Cover tightly and steam for 5–7 minutes, shaking the pot once or twice, until the clams have opened. Lift out each clam as it opens and put it in a wide serving bowl — do not wait for the slow ones.
Overcooked clams turn rubbery in under a minute, so pull them out the moment they open.
Done when: Shells are wide open and the meat is plump and glossy; any clam still shut after 10 minutes is discarded.
2 Mins • Plating Serve hot, about 60°C (140°F)
Pour the hot broth over the clams in the bowl, squeeze over the remaining lime juice and scatter the cilantro and Thai basil on top. Serve at once with the dipping sauce on the side and the broth for spooning or sipping.
The broth is the prize — serve it in the bowl, not strained away.
Done when: Clams are steaming, glossy with broth, and the herbs are bright green on top.
Finishing Touches & Plating
Serve the clams straight from the pot, steaming hot, with the chilli-lime dip and a spoon for the broth — and a bowl on the side for the empty shells.
Nutritional Physiology & Benefits
Energy
166
kcal / serving
Protein
24g
Complete AA
Carbs
12g
Complex
Fats
2g
Healthy
| Energy | 166 kcal |
| Protein | 24 g |
| Carbohydrates | 12 g |
| Fat | 2 g |
| Fibre | 0.5 g |
| Sugar | 1.9 g |
| Sodium | 623 mg |
| Energy | 52 kcal |
| Protein | 7.6 g |
| Carbohydrates | 3.8 g |
| Fat | 0.6 g |
| Fibre | 0.2 g |
| Sugar | 0.6 g |
| Sodium | 195 mg |
Nutrition values are estimated — calculated from USDA FoodData Central values for the listed ingredients.
Vitamins & minerals: Vitamin B12 and iron (clams, in large amounts), zinc and selenium (clams), vitamin C (lime, chilli), vitamin A (chilli, herbs).
Very High in Protein
About 24 g of protein per serving from the clams alone, with almost no fat — one of the leanest high-protein dinners there is.
Rich in Iron and B12
Clams are one of the richest natural sources of vitamin B12 and iron, which support energy and healthy blood — the lime juice helps the body absorb the iron.
Light and Hydrating
Only about 166 kcal per serving, with a warm, brothy finish that replaces fluids and feels gentle after a long day.
Food Pairings
To optimize nutrient absorption and elevate the sensory depth, pair with these authentic accompaniments:
Sides
Steamed Jasmine Rice
Plain rice soaks up the lemongrass broth and turns a light shellfish dish into a full dinner without overpowering the clams.
Vegetables
Fresh Herbs and Cucumber
Cool herbs and cucumber slices refresh the palate between hot, briny clams and add crunch to a soft, brothy dish.
Drinks
Cold Lager or White Wine
A cold lager is the classic Vietnamese pairing with steamed shellfish; a dry white wine works the same way, cutting the richness of the broth.
Soups
Sour Tamarind Soup (Canh Chua)
A small bowl of sour tamarind soup before the clams wakes up the appetite and echoes the lime and chilli in the dip.
Complete menu
Serve the clams as the main dish with steamed jasmine rice, fresh herbs and cucumber, and finish with a small bowl of sour tamarind soup.
Digestive Guardrails
To prevent digestive distress, sluggishness, or palate clash, avoid pairing the dish with these elements:
Clams That Never Open
A clam that stays shut after 10 minutes of steaming may be dead and unsafe to eat — throw it away, never force it open. This is general information, not medical advice.
Very Sweet Drinks With the Meal
Sugary soft drinks overwhelm the delicate lemongrass broth and add a lot of sugar to an otherwise light, lean dinner; water, tea or beer is a better match. This is general information, not medical advice.
General information only, not medical advice — consult a doctor for personal dietary decisions.
Who Should Eat It
Health Conditions — Adjust or Avoid
If you have a medical condition, consult your doctor before changing your diet.
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Cultural Discovery
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