When the summer comes I generally have two things around, some watermelon in my frig and some fresh basil that I'm growing on my balcony or somewhere in my apartment. My favorite drink is a Gin Basil Smash, which I was introduced to when I lived in Germany. This Watermelon Basil Smash has a special touch if you are interested in adding it or can find it. That's some lychee liqueur. It provides a nice touch and builds onto the flavor of the watermelon. If you want to add it, go ahead, if you don't, you still will have a great drink. —Jacob K Thomas
In a rocks glass add ice and set aside. In a cocktail shaker, add the first 4 ingredients and muddle until fragrant. Add gin and watermelon puree. Fill shaker with ice and put the cap on. Shake vigorously for about 30 seconds, or until the shaker is extremely cold.
Strain cocktail into your prepared rocks glass, pour lychee liqueur on top, if using, and garnish with watermelon wedge, and/or basil if using. Serve immediately.
For watermelon puree, take about 1/2 cup or more of fresh watermelon and blend until smooth. Strain out pulp and use the remaining puree for a cocktail. Any remaining puree can be used for another drink.