During summer, I often prepare umami-rich Japanese tea such as Gyokuro and high-quality Sencha with using ice cubes.
This is how I do it. First, place tea leaves in “Hohin” (a Japanese teapot with no handle), and put some ice cubes over the tea leaves in it. All you have to do is just wait until ice cubes melt. Now, tea is ready. Isn't that simple? No need to boil water and worry about steeping time.
Maybe, I can say this is the "real 'iced' tea". Enjoy!