350 g raw medium prawns
1 tablespoon oil
3 stems lemon grass, white part only
3 thin slices fresh galangal
3–5 small fresh red chillies
5 fresh kaffir lime leaves, finely shredded
2 tablespoons fish sauce
1/2 cup (70 g) canned straw mushrooms, drained, or quartered button mushrooms
2 spring onions, sliced
3 tablespoons lime juice
1–2 tablespoons chilli paste, or to taste
fresh coriander leaves, to garnish, optional
Peel and devein the prawns, leaving the tail intact and reserving the heads and shells. Heat the oil in a large stockpot or wok and add the prawn heads and shells. Cook for 5 minutes, or until the shells turn bright orange. Bruise 1 stem of the lemon grass with the back of a knife. Add to the pan with the galangal and 2 litres water Bring to the boil, then reduce the heat and simmer for 20 minutes. Strain the stock and return to the pan. Discard the shells and herbs.
Finely slice the chillies and remaining lemon grass. Add to the liquid with the lime leaves, fish sauce, mushrooms and spring onion. Cook gently for 2 minutes.
Add the prawns and cook for 3 minutes, or until the prawns are tender. Add the lime juice and chilli paste (adjust to taste with extra lime juice or fish sauce). If desired, garnish with coriander leaves.
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