Juice your lime, measure the tequila, passionfruit juice, raspberry syrup, and any optional simple syrup.
If making raspberry syrup at home: simmer ½ cup raspberries, ½ cup sugar, and ½ cup water until thickened. Strain and cool.
In a cocktail shaker, combine tequila, passionfruit juice, raspberry syrup, lime juice, and egg white (or aquafaba).
Shake vigorously without ice for 15-20 seconds to emulsify the egg white for frothiness.
Add ice to the shaker and shake again for another 15-20 seconds to chill and dilute the drink for a smoother texture.
Double-strain the cocktail into a chilled coupe or martini glass to ensure a silky finish.
Top with fresh raspberries, a lime wedge, or grated lime zest for visual appeal.
Sip and savor your vibrant, fruity creation. Cheers!