1 ½ oz amaro, such as Averna, Montenegro, or Nonino
½ oz fresh grapefruit juice
3 oz dry or off dry Lambrusco
1 oz sparkling water, to top
1 grapefruit wedge
1 to 3 Castelvetrano olives, for serving
Add the amaro and grapefruit juice to an ice-filled wine glass or lowball glass. Pour the Lambrusco and sparkling water over top. Stir gently, then add the grapefruit wedge. Add in the olives to taste. Serve immediately.