kei
I bought it (for the half bottle) because I heard a rumor that you can easily lenghthen and heat sake using an empty bottle.
Since I was so curious, I heated up the original contents as well.
According to the instructions on the bottle, it should be lukewarm in 1 minute, but when I followed the instructions, it was clearly hot...
I tried different temperatures while letting it cool down (for the second time), but I liked the aroma and taste of the warmed sake.
It's not a beautiful type of sake at all, but I've never had a sake that felt like "sake" when heated. It is not at all a beautiful type of sake, but it is perfect for drinking sake that has a "sake" feeling when heated.
Of course, I keep an empty bottle.
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