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Garnish: lemon twist
Add all the ingredients except the egg white to a shaker with ice and shake vigorously.
Fine-strain into a rocks glass over 1 large ice cube.
Add the egg white to an empty shaker and dry-shake without ice for about 10 seconds, and pour over the cocktail.
Garnish with a few drops of black walnut bitters. Express lemon peel oils over the top of the drink, then drop the peel in.