Kaku Highball (角ハイボール, Suntory whisky highball)

The ice is half the drink. That sounds like a small claim until you taste a highball made with tired ice, warm soda, and a busy spoon. Then the glass tells on you at once.

Kaku Highball, or Kaku-hai, is weeknight whisky in its cleanest Japanese form: Suntory Kakubin, hard ice, very cold soda, and almost no handling. The point isn't to show off the whisky. It's to stretch its grain sweetness and light smoke into something tall, dry, and brisk enough to sit beside yakitori, karaage, grilled corn, or whatever is coming off the fire. We make it plain because plainness is where the standard shows.

The one detail that decides it is temperature. Fill the glass with ice and stir the whisky over it first, because cold whisky grips the soda without flattening it. Pour the soda down the side, then stir once from the bottom. Once. A highball is not soup, though I have seen it treated with less mercy. Keep the bubbles alive and the drink stays sharp to the last sip.

There is no season when a Kaku-hai is wrong, but it makes most sense when the food is hot, salty, and direct. At an izakaya table it works like a pause between bites, washing the mouth clean without asking for attention. Honmono here is modest: the right bottle, the coldest soda you can manage, and enough restraint to leave the glass alone.