First, start by juicing one grapefruit into a bowl and about 1-2 lemons for fresh juice into a separate bowl.
Measure the 2 fl. oz. of limoncello, 1 fl. oz of grapefruit vodka, 1 fl. oz. of grapefruit juice, and 1 fl. oz. of lemon juice into the bartending shaker with a handful of ice; put a lid on the shaker, and shake for about 30 seconds until the mixture is combined and cooled.
Carefully remove the top of the shaker. Put the Hawthorne strainer over the shaker, and use the fine mesh strainer over your glass to strain your drink from the shaker into your glass of choice. We're double straining this cocktail instead of single straining to make sure we remove all the seeds from the fresh lemon and grapefruit juice.
To garnish, take a vegetable peeler or small paring knife and cut a long curl of lemon rind off of a lemon. Depending on the size of the rim on your glass, you can cut a small incision in the lemon rind so it holds onto the side of the glass, or you can use a long toothpick to skewer the lemon rind as well and place it along the side of the glass.
*Optional: if you'd like to add more lemon flavor to your cocktail, you can "express" the oils in the lemon rind. You can do this by gently squeezing the lemon rind with your fingers, over your drink, a little essential oil will come out of it into your drink. Then rub the inside of the rind over the rim of the glass.
