Add tequila, grapefruit juice, and simple syrup to the shaker.
Shake for 10-15 seconds until well chilled.
Double strain into a champagne flute filled with fresh ice.
Top with prosecco or sparkling wine.
Gently stir with a bar spoon to combine.
Garnish with a grapefruit wedge.
Notes
Store fresh-squeezed grapefruit juice in an airtight container for up to 24 hours.Use 100% agave silver tequila for the best taste.Make the drink without alcohol by replacing tequila with grapefruit soda and prosecco with sparkling water.Keep ingredients cold before mixing for the best results.Double straining removes small ice chips and pulp for a smoother drink.