Heat up the oil and deep fry the crab till the shells are bright red, but not cooked through.
Remove the crabs and all but 1/4 of the oil and discard.
Fry the garlic till light brown.
Add the chilies, ginger and return the crabs.
Stir through and then add the stock.
Add the seasoning and cook till crabs is cooked through. The gravy should be almost dried up.
Dish out the dish and add garnish.
Serve immediately with steamed rice.