Everyone likes a good party drink, and this twist on the original gin fizz is slightly unconventional without landing anyone in unfamiliar territory. In fact, experience leads me to predict you should prepare for compliments. I like this for the blast of lemon, lime, and rosemary, which refreshes without too much sweetness, and is followed by a revelation of aromatic gin. I make the simple syrup ahead of time and steep the rosemary to ensure a healthy transfer of flavor. The syrup’s main purpose is to level the tartness of the lemon-lime juice. I serve this in a rocks glass with ice and add a sprig of freshly cut rosemary from my garden.