Begin by juicing two fresh limes, discarding any seeds. Measure your tequila, passionfruit juice, raspberry syrup, and fresh lime juice. If making raspberry syrup from scratch, simmer equal parts of raspberries, sugar, and water until thickened, approximately 10 minutes, then cool.

In a cocktail shaker, combine tequila, passionfruit juice, raspberry syrup, lime juice, and egg white or aquafaba. Secure the lid and prepare your ice.

Perform a dry shake without ice for 15-20 seconds to emulsify the egg white or aquafaba, creating silky froth.

Add ice cubes to the shaker and shake again for 15-20 seconds until well chilled.

Double-strain the mixture into a chilled coupe or martini glass using a fine mesh strainer.

Garnish with fresh raspberries and a lime wedge. Optionally, add lime zest or edible flowers.

Enjoy your stunning Raspberry Passionfruit Tequila Sour and admire the vibrant presentation.