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Garnish: 3 drops Angostura bitters (optional)
Add the gin, lemon juice, simple syrup and egg white (if using) into a shaker and vigorously dry-shake (without ice) if using egg white or aquafaba. (If not using egg white or aquafaba, skip the dry shake and move to the next step.)
Add ice and shake again until well-chilled.
Strain into a coupe glass.
Garnish with a lemon twist. Or if using egg white or aquafaba, decorate the frothy top with 3 to 5 drops of Angostura bitters.