Wow! So much more intense than the standard White negroni, as Miguel commented, the gentian and aromatised wine (cocchi Americano here) are strongly amplified. Seriously good.
Lots of room to experiment, but the split base with cognac is the distinctive feature here. The interplay between the cognac, the herbal character of the gin, and the bitter ingredients can be overwhelmed by too much of the latter, though. After trying a couple proportions and aromatized ingredients I got a good balance of complementary flavors using equal amounts (3/4 oz each) of gin, a fairly fruity cognac, Bonal Gentiane-Quina, and Cocchi Americano Bianco. Salers has a flavor I didn't care for in this drink; haven't tried it with Suze.
Loved this with Suze. Just made with Alto del Carmen, a barrel aged Chilean pisco (was out of cognac), Salers yellow cap, Cocchi Americano, a splash of Liquore Strega and a few drops grapefruit bitters. Quite good.
Good variation with “Bourgoin Cognac Boise De Fut Neuf”
it’ rougher. Next time i try “Kina L'Aéro d'” of Lillet blanc - the label has the same amazing retrodesign as Suze - a bit like Flash Gordon. I'm not a great swiss fan - but I'm a great fan of Swiss liqueurs