Prosecco Grapes 2 lb. green grapes 1 bottle prosecco 1/2 c. sugar In a large bowl, pour prosecco OR Gingerale OR water over grapes. Let them soak in the fridge for at least 1 hour, unless using water than can use right away.. Drain in a colander and pat dry. On a shallow plate, roll the grapes in sugar until fully coated, then serve.