2 oz Tom Cat Gin (Order a bottle online or find a store near you)
0.25 oz Fresh Lemon Juice
.5oz Cranberry Syrup
Ginger Beer
Rosemary, lime, and cranberry for garnish

Combine ingredients over ice in a copper mug and top with ginger beer. Garnish with a sprig of rosemary, lime wheel, and floating cranberries. Also try skewering the cranberries and coating with sugar for an extra festive look. 

A ‘Buck’ is a category of cocktails that contain spirit, citrus, and ginger beer.