1 cup ginger syrup, or to taste
Crush the frozen cranberries in a large glass pitcher. Add the lime juice and their juiced wedges to the pitcher. Pour in the vodka, cranberry juice, and ginger syrup. Put ice in low-ball glasses and fill glasses about 2/3 full. Top off with club soda and garnish with a shaving of fresh ginger.
Note: Can be made without soda for a martini.