I use a 250g bag of beans, which I have ground (coarse) at the coffee shop. To the grounds I add about 1 - 1.5 L of cold water kind, of alternating grounds/water/grounds/water etc. to make sure the coffee is dampened. Leave to steep overnight...
The morning after, carefully strain your brew. I use a fine sieve, but cheesecloth, or a paper coffee filter would also be the go. Some peeps also use a french press / plunger for this too. Store the liquid in the fridge for your enjoyment, chuck the grounds in the garden for the enjoyment of your plants.
The resulting coffee is quite concentrated - normally I put a bout 1/4 of a cup of coffee and top up with milk or water. You could also add some sugar, maple syrup or whatever! The upside is it stays fresh and ready to rock better than hot brewed coffee, up to 2 weeks.
Tips:
- Stronger espresso roast beans work best
- Use filtered or bottled water
- Use clean containers so that your coffee will stay fresh
- Don't stir the grounds at all, just agitate a little at the beginning to remove air pockets
- Keep the stuff cool, if the weather is warm brew it in the fridge
- Steep time can be from about 8 hours to 16 hours - the longer the stronger
- Try out your favorite / different beans (my favorite so far is Saint Coffee's PNG sundried beans)
- Grind as per fresh press / plunger ie. quite coarse
I think this covers it all, hit me up with questions if I have missed anything. This is really easy to do at home, and I urge you to try it. For junkies like me, it's a good alternative when you have to be sleeping away from your espresso machine, at some philistine friend's house that doesn't have coffee facilities.
Enjoy.
D