Hot and sour (tom yum) soup is a classic Thai soup that is, as the name suggests, spicy and sour. Made well, it is a bracing and nourishing dish with strong yet perfectly balanced flavours.
1.Place stock, coriander root and stem mixture, lemon grass, lime leaves, ginger, chilli and sauce in large saucepan, bring to a boil. Reduce heat, simmer, uncovered, 10 minutes.
2.Meanwhile, shell and devein prawns, leaving tails intact. Add prawns, onion and juice to pan, simmer, uncovered, about 4 minutes or until prawns just change in colour. Remove from heat, stir in coriander and basil leaves.
To make your own fish stock, use prawn heads and shells.