Previously, I've reduced the lime juice (to 20ml) and upped the cassis (to 30ml) in a quest to make this bittersweet 'n' sour aperitivo a touch more approachable...
I "made up" a drink like this when I was a bartender in Tokyo with no idea what I was doing. Mine was a highball that added Zubrowka and soda. For how young I was, I think it was pretty sophisticated.
Really lovely. Not sure how much lime juice I put in (half a lime, but the scale stayed a 0.0oz) but it's the perfect blend of fruitiness on the tongue and bitterness on the nose. Rubbed some lime on the rim for an extra touch of tartness and it was delightfully classy and semi-sweet.
I like up to a point Campari but this one looked a bit daunting so I tried a version by Richard Godwin which used 25ml of both Campari and Lime juice, 10 of Cassis but added 25 of Vodka. It was very nice. A touch tart, bitter but with just a hint of fruit. Possibly should be called a different name but I do not know when ‘adapted’ goes too far…
I think it's ok to very the proportions (I'll experiment) but adding vodka turns this into a different cocktail that requires renaming. As you say, "goes too far..."