Add the Watermelon (1) and Mango (1 cup) into a blender and puree into a liquid. You might need to do this in batches.
Strain the watermelon mango juice into a large bowl to remove any thick pulp, and get ready to juice the other ingredients into the same bowl. Now add the juice from the Grapefruit (2), Sunkist Orange (3), Lime (2), and Lemon (1). Stir well and skim off any frothy bits at the top of the bowl.
Mix in the Caribbean Mixed Essence (3 dash). Place in a jug and chill in the fridge for a few hours if you have time, so you don’t have to water-down by adding ice when it’s served to your guests this summer.