How to make watermelon syrup: Add 1/2 cup of cubed watermelon and 1/4 cup of simple syrup to blender and puree.
Add all ingredients to a high-powered blender and blend to combine.
Pour into Margarita glass rimmed with chili salt. Garnish with a lime wheel or wedge.
Organize your soirée
Put the quantity of ingredients you have, to know how much other ingredients you need and how many cocktails you can make.