Chill your copper mugs in the freezer for at least 15 minutes to keep the drink icy cold and visually appealing.
Place the fresh cranberries into the cocktail shaker and add a squeeze of lime juice, then muddle gently until the berries burst and release their juice, filling the shaker with a bright, tart aroma.
Add the vodka, cranberry juice, and a handful of ice into the shaker. Cover tightly and shake gently for about 10 seconds until the mixture is well chilled and combined, with a slight fizz from the ice.
Remove the chilled mugs from the freezer and strain the cocktail mixture into each mug, ensuring you leave behind any cranberry solids or pulp for a smooth drink.
Top each drink with ginger beer, pouring gently to preserve the fizz and create a lively, bubbling surface that glows ruby-red in the light.
Garnish each mug with a few fresh cranberries and a sprig of mint for a festive, aromatic finishing touch.
Serve immediately and enjoy the sparkling, berry-filled delight with its vibrant color and refreshing aroma, perfect for celebrating the season.
