This was the first Kit Kat that I was truly nervous about eating. I saw it first on the Kit Kat website and I secretly hoped I wouldn't be able to find it. And then it promptly showed up in Atsumi Foods, where I do most of my grocery shopping. I postponed trying it for over a week, but I couldn't ignore it sitting on my shelf forever, so I finally pulled it out and had a taste.
It turns out all that worrying was for nothing. But I will say that Nestle could do a better job with its merchandising. The vinegar part of the name could easily be left out. It was a regular looking chocolate Kit Kat mini that had a slight lemon tang to it. Lemonade Kit Kat would be a better name, I think. There's even a picture of what looks to be lemonade on the package!
Maybe its some cultural thing I'm missing. Perhaps Japanese people like the taste of vinegar. Or maybe the word ベネガ (vinegar spelled out in katakana) doesn't compute because the real Japanese word for vinegar is 酢 (pronounced su.) I don't know. All I know is when I think of vinegar, I think of salad dressing not chocolate. Although, it does bode well for the Apple Vinegar Kit Kat I have to try next.