Soak the
tamarind in 2 tbsp boiling water for 10 minutes, then squeeze and knead
until dissolved. Strain the tamarind water and set aside. Pound the
peanuts in a mortar or whiz in a food processor until finely ground.
Pound, grind or blend the drained chilies, shallots, garlic, candlenuts or
macadamia nuts and lemongrass together to make a paste. Heat the oil in a
wok or heavy-bottomed saucepan and fry the chili paste for 3 minutes. Add
the coconut milk and bring to the boil, stirring constantly. Add the
tamarind water, ground peanuts, sugar and salt to taste and cook for 5
minutes. If too thick, thin with up to 250ml / 8 fl oz water.