When we were at Izakaya Kurakura 蔵倉 in Kyoto recently, we had "Icebreaker" summer sake on the rocks which gave us the idea to taste G sake on the rocks. We posted G sake Joy and G sake Fifty in 2013. While they were good, we were not wild about these sakes (we liked the original G sake) and thought they were a bit too assertive/savory in taste with cloying sweetness (this tendency was more pronounced in "Fifty"). As a result several bottles of G sake have stayed in the refrigerator untouched. Since they were a rather assertive undiluted genshu with higher alcohol content (18% alcohol), we thought they may taste better on the rocks like Icebreaker sake.
We first tried G sake (2013 version) on the rocks.
The glass came from Kitaichi glass 北市グラス in Otaru 小樽. While we were in Japan, we noticed some of the Japanese tumblers were made of incredibly thin glass. We learned that since incandescent light bulbs are becoming a thing of the past in Japan, the same technology used to make light bulbs is being used to make very thin-walled glass tumblers. The ones we bought have little dimples on the sides making them easier to grasp. We tasted G sake "Joy" on the rocks in these tumblers accompanied with deep fried small sweet fish or "ayu".
A few days later, we tried G sake "Fifty" (2013 version) on the rocks. The major difference between "Joy" and "Fifty" is the degree to which the rice has been polished; 40 and 50% (of outer kernel removed), respectively.
This time we had octopus sashimi and raw ocutopus in wasabi yuzu dressing (in the square container, from a frozen package). I also served matchsticks of nagaimo in vinegar dressing garnished with dried "aonori".
We liked G sake "Joy" on the rocks. The cloying sweetness was much less and the slight dilution and icy temperature made the G sake taste crisp and better. G sake "Fifty" got much better than tasting it straight but the cloying sweetness broke through even on the rocks. Certainly, we can drink it much more easily on the rocks than straight. In conclusion, it is a good idea to have G sake on the rocks in hot summer. The assertive tastes of G sakes are actually perfect for on the rocks. We much prefer G sake "joy" over "fifty". We have not tried the most recent brews, however.