Rosemary Nectarine Simple Syrup: – 1/2 cup water – 1/2 cup sugar – 1 nectarine, pitted and cut into 1-inch pieces – 2 sprigs rosemary Rosemary Nectarine Whiskey Sour: – Ice – 1 oz rosemary nectarine simple syrup – 2 oz whiskey – 1/2 oz lemon juice – Soda water, optional