In a small bowl mash the blackberries, strain seeds if desired.
Fill two wine glasses with ice and pour the mashed blackberries evenly into the two glasses. Add about 1/2 shot of raspberry liqueur to each, top with sparkling wine, stir and enjoy! Cheers!
Control the sweetness of your drink by the type of sparkling wine you select. If you like a sweeter cocktail try using a bubbly moscato.
The flavor and sweetness will also be impacted by the berries. I've had both sweet and tart blackberries.