This slushy blender cocktail is perfect for a steamy summer evening. Instead of using ice, freeze the watermelon cubes ahead of serving. Place the cubes in a single layer on a parchment-lined baking sheet and freeze until solid. There is an abundance of peak produce at the farmers’ markets now, and in addition I purchased local raw honey to use as a sweetener. A simply syrup works as well. To make a simply syrup, simmer equal parts water and sugar in a small saucepan until the sugar dissolves. The syrup can be store in the refrigerator for up to a month.