01 -
Place cubed watermelon in a blender and process until completely liquified.
02 -
Place a fine mesh sieve over a bowl and pour the watermelon juice through it. Let juice strain through and leave pulp behind. You should have about 1 cup of juice.
03 -
Pour juice into a mason jar and add sugar. If the watermelon is sweet, use ½ cup sugar. If not, use more. Close jar tightly and shake vigorously for about 2 minutes. Let rest and then repeat for another 2 minutes.
04 -
Put watermelon syrup in the fridge to chill for at least 20 minutes before using. Shake the jar again before using as ingredients may settle.