Apple Amaretto Sour

Combine the amaretto, apple brandy, freshly squeezed lemon juice, and simple syrup in a shaker.

If desired, add the optional egg white for a richer texture.

Shake vigorously to blend all ingredients thoroughly.

Strain the mixture into an Old Fashioned glass filled with ice.

Express the oils from a lemon peel over the cocktail to enhance its aroma.

Garnish with a cocktail cherry for a touch of sweetness.