Ice coffee sounds difficult to make. Do I have to roast the ice first? Should I go for a light roast or dark on it?

Instant coffee, water, milk, ice. Make coffee into paste with water in the cup, pour milk to the top, put in ice, stir not shaken

I appreciate the answer (iced coffee is really popular here in Japan). I was mostly poking fun at how someone would make coffee out of ice (like ice tea -- isn't that just cold water steeped in other water?)