While we don't advise trying to install such a contraption (think of the plumbing complexity!), you can get pretty close to having coffee on tap by buying your own coffee roaster.
Imagine roasting your own beans to the depth and intensity of flavour you love, then grinding them to make the perfect cup of coffee. No, scratch that – to make your perfect cup of coffee.
Why roast when you can pop?
Coffee roasters are quite expensive, but they will save you money on coffee beans in the long run. Green, unroasted beans cost much less (usually half the price or less) than roasted. Many people use an oven, frying pan or even popcorn maker to roast theirs, but as the process can be a bit finicky you can't be assured of even results – so a roaster is best for consistency.
I think I'm ready to be the world's greatest barista! What do I need to know?
Well, first things first – let's take a look at how coffee roasters work.
Roasting causes the colour and smell of the beans to change, producing different flavours and two cracking noises that indicate different stages of the process. You'll hear the first crack of the beans as all the moisture escapes them. At this point, the sugars start to caramelise and your coffee is roasted – however, this is the lightest roast.
As roasting continues, the oils in the beans release to create more flavour and you'll soon hear a second crack. Once you hear this, your coffee will be quite dark and further roasting beyond this point will result in a harsher, possibly bitter cup of coffee.
Letting the beans cool is the final stage, so it's essential to use either a pre-programmed cycle on your roaster, or turn it manually to cool. If the beans stay hot, they will continue to roast and the fire brigade will be called to your house because it will be filled with burnt coffee smoke!
What should I look for in a coffee grinder?
Consider how much coffee you'll be roasting and buy a size that suits.
Quiet noise levels
You'll need to be able to hear the all-important first and second cracks.
Separate cooling tray
The beans need to cool quickly, so it helps to lay them out on a tray.
You'll want to be able to see into the roasting chamber once you hear the first crack – the beans will darken quickly so you need to keep an eye on them.
From $380 to $1600 for domestic models. Commercial models cost much more.