Basil Smash Piña Colada

1. To make the lime sugar. Combine the lime zest, sugar, and a pinch of salt on a shallow plate. Rim your glasses in sugar. 
2. In a cocktail shaker or glass jar, muddle the lime juice, basil (or mint), and 1-2 tablespoons lime sugar (if using) together, squashing everything to release the juices. Add the white rum and dark rum. Fill with ice and shake until combined. Strain into a blender.
3. To the blender, add the pineapple chunks and coconut cream, blend until smooth. Add 3 cups ice and blend until "frozen". Pour into your prepared glasses. Finish with a sprinkle of lime sugar and fresh basil. If you have a paper drink umbrella, add that too. Enjoy immediately.