Here's my cold brew recipe. Note that this does create a very caffeinated brew, perhaps twice as strong as a normal espresso, so it is very easy to overdo it (one of the few times I've ever felt the effects of caffeine was with one of my early cold brew attempts, which I realised afterwards was probably equivalent to around 16 shots of espresso, and I can't say I particularly enjoyed the jittery feeling). Anyway, it is great for cold drinks, although I haven't found a way of heating it up which is as good as my espresso machine.

Ingredients - 40g of beans (4 25ml espresso scoops) - 250ml water

Method - Use a grinder to course grind the beans. - Put grinds in a pyrex measuring jug, add the water, then cover. - Leave overnight, at room temperature. - Filter first through a sieve to remove the coarse grinds, then through a coffee filter to remove the fine grinds (it may take several mins to drip through). - Store in the fridge.