In a cocktail shaker filled with ice, pour the pomegranate liqueur, vodka, grapefruit juice, sour mix, and ginger syrup.
Strain into a chilled cocktail glass and garnish with a lemon twist.
Serve and enjoy!
Martinis are always best with premium vodka. Choose a mid- or top-shelf brand that you enjoy on its own and you'll set a good foundation for your cocktail.
The recipe includes the recommendation of using either Monin Ginger Syrup or homemade syrup. Both are good choices and make a nice drink.
Homemade ginger syrup is very easy. It requires sugar, water, and fresh ginger and takes about an hour and a half before it's ready to be mixed.
While you're making ingredients, consider a DIY sour mix. It's an essential ingredient for many cocktails and is nothing more than simple syrup flavored with lemon and lime juices. By making it yourself you can control the ingredients while saving money compared to store-bought sour.
DeGroff has another version of this cocktail that has essentially the same taste, but takes a different approach to the ingredients. In that recipe, a couple of fresh ginger slices are muddled with about 1/2 ounce each of lemon juice and honey syrup (replacing the sour mix and ginger syrup). You'll then add the same amount of Pama, vodka, and grapefruit juice, fill the shaker with ice, then shake and strain. (Honey syrup is equal parts honey and water mixed to an even consistency.)
Use a ginger liqueur such as Domaine de Canton or The King's Ginger as a substitute for the ginger syrup.