Combine the sugar and berries in a cocktail shaker and muddle together. Add the whiskey, lemon juice and bitters and fill with ice. Shake and strain into a highball glass filled with ice along with the ginger beer. Garnish with a blackberry and the lemon twist.
NotesThis recipe was provided by a chef, restaurant or culinary professional and may have been scaled down from a bulk recipe. The Food Network Kitchens chefs have not tested this recipe, in the proportions indicated, and therefore, we cannot make any representation as to the results.