Heat oil in a cooking pot.
Saute garlic and onion until brown.
Put-in the crabs and cook for about 10 minutes while covered.
Season with salt then pour water and ½ cup of coconut milk into it. Mix well and bring it to a boil.
Then add the squash, cover and cook for another 10 minutes.
Get the remaining coconut milk and pour-in on the pot and cook for 10 minutes.
Transfer into a serving plate. Enjoy!