Not far removed from an Aviation. Depending on your grapefruit juice, this particular Special may be very slightly on the sweet side but it's fantastically...
I felt this was a bit too sweet, but after I added a pinch of citric acid it was fantastic. Maybe they liked their cocktails sweeter back then? Used a homemade kümmel.
If you click on “Mentzendorff Kummel” in the recipe above, this will take you to a page with link: "View 19 cocktails with Kummel liqueur". Alternatively, use the search box to find the "Kummel cocktails" page.