Was chatting with Nicholas's grandma (Yeah! It's ur mum, Duckz/Caroline ;p ) few days ago (while waiting for little girl to leave her tadika), learned this amazing leong soi from her.
So, what'd u do with all these after biting (or cutting) off the best parts? Threw it off, what a waste!
Try this, just dump all the watermelon skin (of course after washing it clean) into a deep pot, put in hot water til just covering the skin, give it a boil, then simmer for about an hour. You may put in 2 or 3 rock sugar for a slightly sweeter version.
Hmm.... so refreshing with some ice cubes...
The verdict: Tasted like the chok che (bamboo sugar cane) leong soi 竹蔗涼水, very refreshing especially after chilling.
I'd checked thru the net, found this site with great info of watermelon (in chinese):