a)grappa, distilled from large amounts of wine that went bad. It has a smokey chocolate character at 80 proof.
b) things you can make with pure alcohol. In EY, you can get stuff like Everclear, but distilled from grapes and kosher le pesach. With this I have made myrtle berry, by soaking the berries and then cutting by 50%, limoncello, a decoction of lemon zest and sugar syrup. You can also make chocolate liquor fairly easily, but it takes three months. Etrog would be nice, but it is nearly impossible to get organic fruit. The ordinary specimen is laced with pesticides.