Beef sour soup with water grass | Samla m'chou kroeung sach ko

+ Ingredients
   - 250g beef, thinly sliced
   - 300g water grass

+ Kroeung
   - 2 tbsp lemon grass stalk, slice thinly
   - 1 tbsp galangal, slice thinly
   - 1 tsp turmeric, thinly sliced
   - Zest of 1/4  kaffir lime
   - 4 garlic cloves
   - 2 shallots
   - 2 tbsp krasaing seeds
   - 1 tbsp prahok, chopped
   - 2 tbsp fish  sauce
   - 1 tbsp salt
   - 1 tbsp sugar
   - 4 cups water
   - 2-3 stems of Sleuk kan-trup
   - 1-2 fresh red chili , for a garnish

+ Method
    Kroeung is ready to cook. remove old leaves of tra-koun from their stems and through away, keep the tip leaves.Crash its stalk with big knife and cut 4cm long, wash and drain.

  Fry kroeung and prahok with oil in a large pot over a medium low heat and add a bit of water when the smell bring out from kroeung of aroma intensifies add sliced beef  and fry for a while, season with salt and sugar, allow it to cook until meat is done.

  Then add the rest of water and continue to boil, simmer for 10 minute by which time the beef should be very fender.Add Tra-koun when it turn seal add krasaing seeds and remove from heat.

  Brush the kantrup stem over the flame, nest remove leaves and add to the soup.