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Last Saturday I put up nine jars of single-note bitter tinctures.
These are each built of 1/5 oz of herb steeping in 3oz of 100° vodka. I plan to monitor them by tasting starting tomorrow evening and every day or so thereafter until each seems adequately bitter.
The goal is to get some familiarity with these and then use the experience to concoct more complex bitters (along the lines that DrinkBoy suggested in someother thread). When these are ready for tasting, I'd be more than happy to share them around, as I'm sure I have little need to consume or keep all of it myself.