How to make great coffee at home: beans, grind, ratio, water temperature and freshness

TUREFF• •0

Good coffee at home has less to do with expensive equipment than with five things you can control every morning: the beans, the grind, the ratio of coffee to water, the water temperature and how fresh it all is. Get those right and a cheap dripper or plunger will beat most office machines.

Start with the beans

Buy whole beans where you can. Ground coffee goes stale far faster, because so much more of it is exposed to air.
Look for a roast date, not just a best-before date. Many roasters suggest beans taste best roughly one to four weeks after roasting. Very fresh beans still give off a lot of gas, which can make brewing uneven for the first few days.
Pick a roast to suit your taste. Lighter roasts tend to taste brighter and fruitier; darker roasts taste heavier, more bitter and more roasty. Neither is better.

Grind just before brewing

Ground coffee tastes best within minutes of grinding and fades noticeably over the following days. If you buy one piece of kit, make it a burr grinder, which produces more even particles than a blade grinder. Match the size to the method:

Coarse for French press and cold brew
Medium for drip machines and most pour-over
Fine for AeroPress (depending on recipe) and moka pots
Very fine for espresso

If the coffee tastes sour and thin, try grinding finer. If it tastes harsh, bitter and drying, try coarser.

Weigh the coffee and the water

Scoops vary; a kitchen scale does not. A common starting range for filter coffee is 1:15 to 1:17, meaning 1 gram of coffee to 15–17 grams of water (a gram of water is a millilitre).

For one large mug of about 300 ml, that is roughly 18–20 g of coffee.
Too strong? Move towards 1:17. Too weak? Move towards 1:15.
Change one thing at a time, so you know what made the difference.

The Specialty Coffee Association's brewing standard sits in this same area, at around 55 g of coffee per litre of water.

Water temperature and quality

Aim for roughly 90–96°C. Water straight off a rolling boil is a little hotter than ideal; letting the kettle sit for about 30 seconds brings it down.
Too cool tends to taste sour and weak; too hot can pull out more bitterness, especially with dark roasts.
Coffee is mostly water, so if your tap water tastes of chlorine or is very hard, filtered water makes a clear difference. Very soft or distilled water, on the other hand, can taste flat.

Keep everything fresh and clean

Store beans in an airtight, opaque container at room temperature, away from heat and sunlight.
Avoid the fridge for daily beans: they pick up moisture and smells. Freezing in small sealed portions works if you buy more than you can use in a few weeks.
Rinse paper filters with hot water before brewing to remove any papery taste and warm the brewer.
Clean your equipment regularly. Old coffee oils turn rancid and make fresh coffee taste stale.

A simple routine to start with

Heat the water and let it settle just below boiling.
Weigh 18 g of beans and grind them medium.
Brew with 300 g of water using your usual method.
Taste it, then change only one thing next time: grind, ratio or temperature.

After a week of small changes you will know your own preferences far better than any recipe can tell you. What do you brew with, and what made the biggest difference to your coffee? Share your routine or ask a question in the comments below.