Clean the crabs by washing in running water and brushing it with toothbrush if a little dirty.
If the crabs are large, you can divide it by cutting it in half. Then set aside.
In a deep pan or wok, heat some cooking oil and saute garlic and onions until the onions are soft.
Then add the ginger and saute again for half a minute. Pour patis and let it simmer for a while.
Stir and add in the squash. Continue stirring for a minute then add in the string beans.
Saute for a few seconds then add in the crabs. Pour also the coconut milk and bring to a boil and cover.
Cook for about 5 to 8 minutes and stir it from time to time so the crabs will be evenly cooked.
Season with salt and pepper before turning off heat. Serve hot with lots of cooked rice.