Start by making the Lemon Lime Simple Syrup. Combine sugar, water, lemon zest, and lime zest in a medium saucepan set over medium heat. Stir until the sugar has dissolved into the water. Bring the mixture to a boil, let bubble for 1 minute, then take the saucepan off the heat. Cover and let infuse for 30 minutes. Strain the syrup into a clean jar, and store in the refrigerator for up to 1 month.

To make the cocktail, add citrus vodka, grapefruit juice, and simple syrup to a Collins glass filled with ice. Stir until well combined and chilled. Add IPA and gently stir just to combine.

Taste a bit of the cocktail for balance. If it is too bitter, add more simple syrup. If it is too sweet, add more grapefruit juice.

To garnish, submerge the strip of grapefruit zest into the cocktail.