Crush the outer shell of the monk fruit and peel away the shell
Add monk fruit and dried longan fruit, and 1500 ml water to a large pot with a tight-fitting lid. Bring to a boil and then lower the heat, cover and let them simmer for 15 minutes
Add winter melon strips and rock sugar and simmer for another 15 minutes. Have a taste and add more sugar if necessary. Put the lid back on and then let everything sit in the pot for about 1 hour for a stronger flavor. Uncover and have a taste
Air mata kucing can be served warm, room temperature, or ice-cold