Pinoy Style Black Pepper Crab (Alimasag)

Ingredients:
2 lbs large mud crabs or prawns, claws cracked, shells removed and cleaned. Drain to dry.
4 tbsp freshly ground black pepper
3 to 4 fresh red chilli, seeded and finely chopped
4 tbsp butter
10 cloves garlic, peeled and chopped
10 slices young ginger
4 tbsp oyster sauce
4 tsp dark soya sauce
4 tsp sugar (optional)
Oil for deep frying
How to cook:

1. [...]