A plumb in a cocktail Dec 09, 2021 Posted by: IceBreakerPro Mixologist Egg white, Gin, Lemon juice, Plumb, Simple syrup Wanna try something a little different? A gin plum sour. why? why not. we got a lot of feedback on this one right after we posted it on instagram. people loved it. of course really good ripe fruit and the right gin help.