Have you ever made coffee with the Chemex? No? No problem, we’ll explain how you can use the glass filter carafe to make a particularly clear and aromatic coffee.
What is a Chemex?
The Chemex is a traditional way of preparing filter coffee. The German chemist Peter Schlumbohm invented the filter carafe in the mid-20th century by building a glass funnel onto a simple Erlenmeyer flask. You may remember the latter from your school lessons, because the Erlenmeyer flask is normally used for chemical experiments. Schlumbohm traveled to the United States to sell patents for other inventions there. In 1941 Schlumbohm registered the patent for the invented filter carafe. To this day, the Chemex and its special filters are manufactured by the Chemex Corporation in Chicopee (Massachusetts, USA) and distributed worldwide.
At the time, Schlumbohm was probably not aware that he had invented a real cult device. The shape of the machine is reminiscent of an hourglass. The heat-resistant wooden belt that connects the two pieces of glass and also serves as a handle is striking.
What is special about a Chemex?
In 1958, thanks to its design, the Chemex even made it into the New York Metropolitan Museum of Modern Art, one of the most important art museums in the world, and it is still there today. However, the long-standing popularity of the machine can be explained above all with the consistently high-quality coffee result. Its secret lies in the extra thick coffee filter, in which oils, suspended matter or sediments are retained. This gives you a very pure and tasty coffee without a lot of bitter substances. In addition, the filter is shaped like a cone, which means that the coffee is extracted very evenly with this pour-over method. You usually have to buy the coffee filters separately.
How to make coffee with a Chemex
Preparation with a Chemex is quick and easy. Nevertheless, it is important that you follow the individual steps in order to be able to enjoy the full coffee aroma at the end. This is the pour-over method with a filter, which we will now present in more detail.
Ingredients needed for one liter:
60 grams of ground coffee with a medium to coarse grind
1 L of water with a temperature of 96 degrees
Step 1: Heat the water
The ideal water temperature is about 96 degrees. If you don’t have a thermometer, heat water in a kettle and then wait two minutes. The water is then almost at the perfect temperature.
Step 2: Unfold and insert the filter
When you unfold the filter, you get a page with three layers of paper. It is very important that this side is on the Chemex spout. This makes the filter paper more stable on this side and prevents it from getting stuck in the spout during extraction and preventing air from escaping from the carafe.
Step 3: Rinse the filter
Pour hot water into the filter without coffee in it. In this way, you already warm up the filter and can use the water that has passed through to remove any residue from previous preparations. At the same time, the inherent odor of the filter disappears. Then throw away the water that has run through. Then reinsert the filter.
Step 4: grind coffee
Grind the coffee on a medium to coarse setting. After grinding, the coffee should resemble the structure of sea salt.
In general, the more coffee you use, the coarser the grind should be.
Maybe try a little bit here. You have found the best result when the extraction of the coffee, i.e. the process in which the coffee runs through the filter, takes between four and five minutes.
Step 5: Start blooming process
Put the appropriate amount of coffee in the filter and add some water. The amount of water depends on the amount of coffee. For blooming, you should always take twice as much water as coffee. It is advisable to add the water slowly and in circles from the inside out. The ground coffee should be completely covered with water. Now wait about 40-45 seconds. During this time, the remaining CO2 escapes and the coffee soaks up the water. By allowing the CO2 to escape, blooming ensures a more even extraction and a more stable coffee bed.
Step 6: Add water
Slowly pour in the rest of the water in a circular motion. There should be at least an inch of space between the water and the top of the funnel. Avoid pouring water directly onto the filter. In this case, the water would pull through the paper and not come into contact with the coffee. You may have to refill several times.
If the coffee has seeped into the lower part of the Chemex, remove the filter. The Chemex coffee is ready!
