Watermelon syrup is a vibrant simple syrup made by simmering fresh watermelon juice with sugar (often in a 1:1 ratio) until it reduces into a bright, translucent sweetener. Thanks to the natural fructose and high water content of the fruit, it brings crisp, refreshing, and sun-drenched notes—sometimes boosted with a squeeze of lime or a pinch of salt—making iced teas, lemonades, and summer cocktails taste lighter, fruitier, and more “garden-fresh” than regular simple syrup.