Destination
Koh Samui
The story
Tom kha goong is Thailand's most beloved coconut soup — the softer, creamier, more accessible sister of tom yum: a coconut-milk-based broth built on galangal (Thai ginger's stronger cousin), lemongrass, kaffir lime leaves and bird's-eye chilies, cooked with prawns, straw mushrooms and cherry tomatoes, finished with fish sauce, palm sugar and fresh lime juice. The name means "boiled galangal soup with prawns" — galangal is the flavour marker, and its warm-pine-citrus character is what distinguishes tom kha from every other coconut soup in Southeast Asia. Sold at every Thai restaurant abroad and every home dinner table in Thailand; the classical presentation is in a large communal bowl to be spooned over rice, or in individual bowls as a soup course.
Method
In a pot, combine water/stock, galangal, lemongrass, kaffir lime leaves, shallots and crushed chilies. Bring to a boil, reduce to a simmer, cook 12 minutes to extract aromatics.
Pour in the coconut milk. Simmer 5 minutes to marry (do not boil hard or it splits).
Add mushrooms. Simmer 4 minutes.
Add prawns and cherry tomatoes. Simmer 3 minutes until prawns are just pink.
Stir in the coconut cream. Warm through 60 seconds — do not boil after adding cream.
Off the heat, add fish sauce, palm sugar and lime juice. Add extra chilies if you want more heat. Stir to dissolve the sugar.
Taste — should hit salty, sweet, sour, mildly spicy and deeply coconut-y. Adjust with more lime (if flat), fish sauce (if too sweet) or palm sugar (if too sour).
Ladle into bowls or one large tureen. Top with coriander, Thai basil (if using), extra chili and lime wedges. Serve with jasmine rice on the side. Diners spoon soup over rice or eat as a soup course.
Tips
- Galangal, not ginger. This is the flavour marker. Ginger tastes completely different. Any Thai grocer sells fresh galangal; frozen works too.
- Kaffir lime leaves are essential. The specific citrus-pine note doesn't come from anything else. Tear (don't slice) so the aroma releases.
- Do not boil after adding coconut cream. Boiling splits the cream and turns the broth grainy. Warm through and remove from heat.
- Season off the heat. Lime juice loses brightness when boiled. Add at the finish.
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