Combine lemon juice, Simple Syrup, pamplemousse liqueur, vodka and a scoop of Ice into a mixing glass.
Cap, then shake vigorously 20X, until chilled.
Remove cap.
Add prosecco.
Strain drink into a champagne flute.
Twist a grapefruit peel over the drink, rub it around the rim, then drop it into the drink, as shown in the photo.