Made two versions of this cocktail, and enjoyed the second one with 1/2 ounce lemon juice, rather than a full ounce.
I found the lemon overwhelming in the recipe posted. Adjust to your taste.
Used Michters US-1 Rye, Hiram Walker Kirshwasser, Taylor's Falernum, and Peychaud's.
I tried this with Bulleit Rye and Clear Creek Kirschwasser. I agree that it is pretty tart with the amount of lemon specified; I'll try .75 oz next time. I do like the drink overall though- the Kirschwasser and Falernum get along better than I would have guessed.
This is good, but I agree that adjustments are better, I used:
Jim Beam (finishing off the bottle), Clear Creek, Taylor's, and 1/2 oz.lemon with Peychaud's.
Close, but next time I'll probably reduce the Falernum to match the reduced lemon. And I'll have to try it with a true Black Forest kirsch like Schladerer. And another American kirsch like Aqua Perfecta. And other ryes, possibly increasing that to 1½. I think it'll be worth another few tries.