Watermelon Martini 1 Moderate 5 Mins 1 cup watermelon, roughly diced 1/8 cup sugar, granulated 1/4 cup water 2 oz vodka 1 lime Add sugar (1/8 cup) and water (1/4 cup) to a small pan over medium heat and stir until dissolved. We prefer drinks that aren't too sweet, but if you want a sweeter drink use equal parts water and sugar to make simple syrup. Optionally, combine 75% granulated sugar and 25% salt on a plate. Rim your cocktail glasses with lime and then place in the sugar mixture to coat. Muddle the watermelon (1 cup) in a cocktail shaker. Add the vodka (2 oz), sugar water, juice from the lime (reserving some lime for garnish) and ice. Give it a vigerous shake for about 15 seconds. Strain the watermelon cocktail into a glass and garnish with some lime.