How To make Hot and Sour Mushroom Soup (Tom Yam Het)

3 c Vegetable stock
1 ts Nam Prik Pow sauce
1 Inch Lemon grass

finely chopped into rings 3 Kaffir lime leaves
:

roughly torn into three 1 ts Sugar
2 tb Lemon juice
2 oz Oyster mushrooms
-- coarsely separated -OR- button mushrooms 2 sm Fresh red or green chilis
- (more if desired)

crushed to split open :

TO GARNISH--------------------------------- Coriander leaves In a large pan, bring the vegetable stock to the boil and stir in the Nam Prik Pow sauce. Add the remaining ingredients and simmer, stirring well until the mushrooms are just cooked but still al dente. Pour into a serving bowl and garnish with coriander leaves.