3/4 oz Aperol
1/2 oz Lemon Cordial/Sherbert (*)
1/4 oz Lemon Juice
Shake with ice, strain into a flute glass with 2 oz Cristalino sparkling wine, and garnish with a grapefruit twist.
(*) Perhaps lime cordial such as Rose's would work in a pinch. Also upping the lemon juice to a 1/2 oz might cut the sweetness a touch.