Life is too short to drink boring lemonade . . . and life is also too short for a lemonade recipe. Enter: this watermelon lemonade sweetened with vanilla bean simple syrup and garnished with a mint sprig. Depending on the ripeness of your fruit, you may need to add more or less sugar and lemon juice, which is why this how-to offers proportions and eyeballed measurements, so you can taste and doctor to your liking.