I didn't know there was a Japanese iced coffee. Before Starbucks was popular here and I'd order iced coffee from the local cafes, they would indeed bring it to me like this, but I didn't think much of it. I thought this was how we did it in the States too. hmm... interesting!
But... is it popular this way? I never liked it because the ice cubes water the coffee down, making the taste weaker. I suppose it would be better if you started with something stronger, such as an Aeropress can give. Then having it watered down a bit with the ice would be ok.
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Brewer from the States also calls this type of brewing Japanese Iced Coffee. The naming apparently based on how filter/pour over method is popular in Japan to make Iced coffee back in the day. I suppose each country has their own way of naming their filtered coffee for example, in Laos and Thailand they have Olieng and Oliang which are similar in a way.
It's probably not popular but it's on the menu of cafe. I suppose you wouldn't have to worry about watering down the coffee because the initial method is weighing the ice cubes so that they have proportionate measurements. There are some people who don't measure the Ice cubes like I do but the common proportion would be 225g of Ice cubes and 225g of water with 30g of coffee ground. If starting with an espresso, that would be Iced Americano :D and it's lot different brewing method from filtered coffee.