First, ...24........ the water into a saucepan. Bring to a boil. Next, .......25....... the lemon grass and kaffir-lime leaves. Then add the prawns. ......26...... and simmer for 3 minutes. Add the mushrooms. salt and......27....... After that simmer for a few more......28........ ......29..... from the heat and season with fish sauce. .......30....... and chilli powder. Finally sprinkle with the chopped coriander leaves(From Thai Life)