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Add Irish whisky, lemon juice, simple syrup and egg white to a shaker and dry-shake for 30 seconds without ice. Add ice and shake again until well-chilled. Strain into a glass.
- INGREDIENTS: 2 oz (6 Cl) Irish whisky 3/4 oz (2.2Cl) lemon juice, freshly squeezed 1/2 oz (1.5Cl) simple syrup 1/2 oz (1.5Cl) egg white (optional)