Prep the glasses. Salt the rim of a margarita glass. Rub it thoroughly with a lime wedge and dip the top of the glass in a small plate with salt and chili powder (or tajin) mix. For best results use chilled glasses!
Blend. Add all the ingredients for the margarita cocktail in a blender and process until all mixed well and there are no chunks of watermelon. Depending on your blender you’ll need to add x amount of cold water to make the blending process smooth. Also for the ice, if high power blender then, you can use ice cubes, alternatively crushed ice will blend easier.
Serve. Using a spoon divide the drink between the prepared glasses, don’t create a very high ‘’tower’’ on top as you won’t be able to transport the glasses to the table. Also, the drink melts quickly, especially if outside in warm weather, so use your best judgment! Garnish with basil leaves, watermelon slice, lime and serve immediately. Enjoy!
