Add a gallon of water to loomi in a non-reactive pan. Bring to a boil, simmer for 5 minutes, turn off burner and cool. (I put a lid on the pot).
Strain and then add the sugar. Let sugar dissolve at room temperature.
Stir, taste for sugar and chill.
Serve chilled with ice cubes.
Note: You can also leave the loomi soaking in the gallon of water overnight. In the morning, bring to a boil, turn heat off and strain and add sugar. But the recipe above can be used when making it in a hurry.
Also, crush the loomi into small pieces using a mortar and pestle. This brings out the flavor and sourness.