I think I may have to try this with rosemary simple syrup. (nourish-and-fete.com)
In a cocktail shaker, combine cream or whole milk (two - percent if you must, but never skim) with one teaspoon of rosemary simple syrup * and a handful of ice cubes. (bonappetit.com)
Shake gin, lemon juice and rosemary simple syrup in a cocktail shaker filled with ice. (inspiredtaste.net)