kg Crab, cleaned and halve

Grounded Ingredients:

2 lemon grass (serai)
1" galangal(lengkuas)
3 nips garlic
1" ginger

For the sauce:
1 tbsp light soya sauce
3 tbsp thick soya sauce
2 tbsp oyster sauce
1 tbsp sweet plum sauce(optional)
A few drops sesame oil
1-1/2 tsp corn flour + 1 cup water
Salt to taste
2 tsp sugar

For Garnishing:

2 red chillies chopped thinly
1 stalk spring onions