To a cocktail shaker, add amaretto, bourbon, lemon juice, simple syrup and egg white.
Shake vigorously for 30 seconds doing a "dry shake".
Add two ice cubes and continue to shake until the ice is dissolved.
Add the remaining ice to a rocks glass.
Strain and pour over the fresh ice.
Garnish with lemon peel and cherry. Serve immediately.
When using egg whites in cocktails, it is important to do a "dry shake" aka a shake without ice, in order to create the silky/foamy texture of the egg white. Once that texture is achieved you can add the ice.
We used an Amarena cherry for the garnish. We buy ours from Trader Joe's, but if you cannot locate these, you can also use a Maraschino cherry.
If you do not have bourbon, you can substitute with brandy.