according to SeriousEats, “Vermouth and soda is a classic low-alcohol drink, enjoyed throughout much of Europe. It’s past time we Americans cottoned on, especially now that delicious, complex-tasting vermouths such as Dolin are available here.” maybe the addition of cabbage juice is what’s needed to push it over that edge.
(and I know, club soda and tonic water aren’t the same thing. just go with it….)