New Caledonian Coconut Prawn Soup

About This Recipe

New Caledonia's food culture is one of the most genuinely multicultural in the Pacific, shaped by the indigenous Kanak people alongside French colonists, Vietnamese indentured labourers who arrived from the 1890s onward, Indonesian and Wallisian communities, and later waves of immigration from metropolitan France. This coconut prawn soup is a dish that could only have emerged from that layering: the broth technique owes something to Vietnamese pho and Thai tom kha gai, the prawn is the star ingredient of the Kanak and French fishing traditions, and the fish sauce and lemongrass are fixtures of the Vietnamese-Caledonian kitchen that flourishes in Noumea's markets. The result is a soup with very few ingredients — six at its most stripped-back — that achieves an unusual depth of flavour through the careful sequencing of aromatics. The technique is uncomplicated but the timing is everything. Lemongrass is bruised and simmered in fish stock for a full five minutes before the coconut milk is added; this extracts the grass's volatile citronella and floral oils into the aqueous broth in a way that simply adding it with the coconut milk does not. When the coconut milk joins the broth it should be maintained at a gentle simmer — never a hard boil, which would cause the emulsion to break and the fat to separate into oily droplets. The prawns enter the pot last, cook for no more than four minutes, and are served immediately in warmed bowls. The test of a good version of this soup is the broth: it should be pale gold, lightly sweet, gently spicy, and balanced between the brackish depth of fish sauce and the brightness of lime added at the table.

Ingredients

Serves 4

• 500 graw tiger prawns(peeled and deveined, shells reserved)
• 400 mlfull-fat coconut milk(shake the can before opening)
• 500 mlfish stock(or prawn shell stock (see tip))
• 2 stalkslemongrass(outer layers removed, bruised with back of knife)
• 1 redchilli(bird's eye or large red, thinly sliced)
• 2 tbspfish sauce(good quality, such as Tiparos or Megachef)
• 2 wholelimes(one juiced, one cut into wedges to serve)
• 3 stalksspring onion(thinly sliced, to garnish)

Instructions

1. 1

   Build the aromatic base

   Pour fish stock into a medium saucepan and add the bruised lemongrass stalks and sliced chilli. Bring to a simmer over medium heat and cook gently for 5 minutes, allowing the lemongrass oils to infuse the broth. The stock should turn faintly yellow and smell intensely citrusy.

   To amplify the prawn flavour, simmer the reserved prawn shells in the stock for 10 minutes before adding the lemongrass, then strain them out. This is the step that separates a restaurant-quality result from a home version.

2. 2

   Add coconut milk

   Reduce the heat to medium-low and stir in the coconut milk and fish sauce. Bring the soup back to a gentle simmer — you want lazy bubbles breaking the surface, not a rolling boil. Maintain this temperature while you taste and adjust: add more fish sauce for depth, a small pinch of sugar if the coconut milk is particularly sour, or an extra chilli if you want more heat.

3. 3

   Add prawns

   Slide the peeled, deveined prawns into the simmering broth in a single layer. Cook for 3–4 minutes, turning once, until the prawns have curled into a loose C-shape and turned uniformly pink-orange throughout with no grey patches remaining at the thickest part.

   If a prawn curls into a tight O-shape it is overcooked. Pull the pot off the heat the moment they hit that C-curve and serve immediately.

4. 4

   Final seasoning

   Remove the lemongrass stalks (they are too fibrous to eat). Squeeze the juice of one lime into the soup and stir. Taste the broth once more — it should be simultaneously rich, sharp, slightly spicy, and savoury. If any element is missing, this is your last chance to add a drop more fish sauce, lime, or a pinch of salt.

5. 5

   Serve

   Ladle the soup into four warmed bowls, ensuring each receives a generous portion of prawns and broth. Scatter sliced spring onion over the surface and place a lime wedge on the side of each bowl. Serve immediately with jasmine rice or crusty bread for dipping.

Variations

• •

  Add 100 g of thin rice noodles (soaked per packet instructions) to each bowl before ladling over the broth to transform this soup into a substantial one-bowl main course.

• •

  Crab version: replace tiger prawns with 400 g of fresh blue swimmer crab claws — simmer for 6 minutes and crack at the table for a more dramatic, Caledonian-feast presentation.

• •

  Mushroom and tofu version: replace prawns with 200 g each of oyster mushrooms and firm silken tofu cubed into 2 cm pieces; swap fish sauce for light soy sauce and use vegetable stock for a fully vegan soup with the same aromatic profile.

• •

  Richer laksa-style: stir 1 tablespoon of good-quality red curry paste into the aromatics before adding the coconut milk for a deeper, more Southeast Asian character that reflects the Vietnamese-Caledonian kitchen's influence.

Storage

Store the soup (without cooked prawns if possible) in a sealed container in the refrigerator for up to 2 days. Reheat the broth gently to just below a simmer, add fresh raw prawns, and cook them from raw for the best texture — reheated cooked prawns become rubbery. Do not freeze this soup as coconut milk separates on thawing.

Frequently Asked Questions