This is traditionally made from whole fresh crabs cooked in boiling water. This recipe can easily be made with crab meat that you purchase, however. The food should be steamed in a bamboo steamer to avoid condensation dripping onto the cooking food. Alternatively if you use a metal steamer cover the food with a paper towel which is not in contact with the food, or simply steam the crab in a microwave on medium or low heat. If you use a microwave let the dish stand for one minute after each three minutes cooking, and check for "doneness" by probing it with a fork.
If you prefer to omit the pork, use extra crabmeat or chopped shrimp.
Combine all the ingredients in a food processor, and then spoon a quarter of the mixture into each of four crab shells or ramekin dishes, and steam for about 15 minutes until cooked.
Garnish with slivered red and green chillis and coriander leaves.