1.Place coriander leaves and root, lemongrass, chillies, garlic, ginger, eschalots, sauce and cumin into the mini chopper attachment of a hand blender or the base of a tall jug. Using hand blender, process to a smooth paste. Transfer to a sterilised jar.
Authentic green fish curry
2.Heat oil in a frying pan on high. Add 1/2 cup paste and fry for 2-3 minutes.
3.Stir in coconut milk, stock, sugar, leaves, sauce and juice. Bring to the boil. Reduce heat to low and add fish. Simmer, stirring, for 3-4 minutes, until fish flakes when tested with a fork.
4.Serve with rice, coriander leaves and lime wedges.