Basically, a Negroni with bourbon replacing gin. The original 1927 recipe calls for equal parts, but I've previously favoured a 3:2:2 (45ml bourbon, 30ml...
I've enjoyed Negronis for a few years, but I'm not a big fan of gin, so this is an amazing alternative. I've tried bourbon and Irish whiskeys for this and both are a very nice option. I think Tullamore DEW has been my favorite so far though.