Strawberry Elderflower Tequila Sour

Add the first four ingredients (strawberries, tequila, lemon juice, elderflower liqueur) to a cocktail shaker and muddle until the strawberries are well broken down. Strain the mixture and then add in the egg white before dry shaking (without ice) for about 15 seconds or until a nice foam is created. Add ice to the shaker and shake again until the sour is well chilled. Strain the cocktail into a chilled coupe glass and serve with a sliced strawberry for garnish!