In Sweden we have a long tradition of herb and spice infused spirits, or "snaps" as we call it. Many of these are made with caraway and/or dill seed, which are also the ingredients which characterize the Aquavit type of spirit, common in both Sweden and Denmark. I have only made it myself once, but it was quite successful and extremely easy to make. I cannot remember the exact recipe I used, but the ingredients were dill seed, caraway seed and lemon zest. I think the proportions (to one standard bottle of vodka, 700 ml in Sweden) were something like a table spoons each of dill and caraway seed, and lemon zest from about 1/4 lemon. All of this was just combined in a jar and left to steep for a couple of weeks.