Pour all ingredients into a shaker. Dry shake (shake without ice) to properly froth the egg white. Then fill the shaker with ice and shake again. Strain into a glass and garnish as desired. The simple syrup is made with 3 parts sugar and 2 parts water.
Recommended peach liqueur: Peachtree. The simple syrup can be made with 3 parts sugar and 2 parts water.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Peach Sour.