A Summer Evening cocktail is a modern take on a classic Caribbean-inspired drink, blending aged rum with elderflower liqueur, watermelon juice, and a couple of dashes of Angostura bitters. It's sweet, refreshing, and perfect for sipping on a hot summer evening. The watermelon juice gives it that extra oomph, and the bitters balance out the sweetness. It's a cocktail that'll transport you straight to a tropical paradise. Cheers!