Love iced coffee. But four teaspoons would send me into a spin! I bet it makes a good coffee though. I always find my home made iced coffees are a bit weak on the coffee flavour. I suspect being cold dulls the flavour down, and of course higher volume. I tried using one of those coffee syrups to boost the flavour but found it a bit too sweet and with an odd background flavour. I’ve found making a strong plunger coffee and putting it the fridge to cool down give the best result, but that requires preplanning which I don’t always do.