An easy Vodka and Watermelon Cooler drink recipe. May 28, Watermelon Frosty Recipe for summer. Frozen watermelon, lime and banana blend in this crowd-pleasing, refreshing smoothie. Place the ice cubes into a blender. Cover, and pulse until crushed. Add the watermelon and blend for about 1 minute, until slushy. Add the honey, and blend for.