1Begin by shelling the raw shrimp and chop the tomatoes and the mushrooms.Set these aside. Bring water and bouillion to boil.
2Add the lemongrass and fish sause to the bouilion water and continue to boil- add the lime juice. Add the cayaene pepper to the water and add the tomatoes. Let this boil for a minute and add the chopped mushrooms.
3Turn the soup mixture off and add the raw , peeled and deveined shrimp to the hot soup-but do not boil- just cover and prepare to serve. Top with chopped cilantro.