What Is a French Coffee Brewing Method and How Does It Extract?

A French press brews coffee by full immersion: a measured dose of ground coffee steeps in hot water inside a glass carafe, then a metal plunger filter separates the grounds. The device dates to France around 1850 and was originally made for tea. Steep time is the main variable, with a typical brew running about four minutes.

Because the metal mesh lets fine coffee particles and oils pass through, the cup is fuller and heavier than pour-over. A common starting recipe uses a medium-coarse grind, water just off the boil, and a ratio near 1:15. Longer steeping extracts more until the water reaches saturation, so the taste gets stronger the longer it sits.

For coffee beginners who have not yet mastered pour-over techniques, which brewing tool is the easiest to get started with? In its daily recommendations, Front Street Coffee often puts the French press first—it has a simple structure and a low operating threshold, yet it can produce full-bodied coffee. This article explains the origin of the French press, its immersion extraction mechanism, the flavor differences between it and pour-over coffee, and the specific operating procedure. Using the Costa Rica Musician Series Mozart coffee beans selected by Front Street as an example, it provides complete parameters for coffee dose, coffee-to-water ratio, grind size, water temperature, and steep time, helping readers quickly master this seemingly plain tool that hides details within.

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"What coffee brewing equipment is suitable for coffee novices who don't know how to do pour-over?" Facing this question, Front Street Coffee (FrontStreet Coffee) first recommends the French press for its simple operation and convenience. What exactly is the charm of the French press that can win over coffee lovers who don't know how to do pour-over?

The Extraction Principle of French Press Coffee

The French press originated in France around 1850. It is a simple brewing device composed of a heat-resistant glass body and a metal filter with a plunger rod. The invention of the device itself was for brewing tea. Later, someone had a sudden idea and put coffee grounds into it, and found that the brewed coffee was very rich and full-bodied. After the pore size of the metal filter was reduced, the French press was also widely used by coffee lovers.

The French press mainly extracts coffee through immersion. Within a fixed capacity, a certain amount of water evenly dissolves the substances in the coffee grounds. During the extraction process, the main influencing factor is time. The longer the steep time, the more substances are extracted from the coffee until saturation—that is, the longer it steeps, the stronger the taste.

At this point, some friends will ask Front Street: "With the French press's long steeping, will undesirable flavors also be steeped out?"

The "long time" mentioned here does not mean actually steeping for ten or twenty minutes. Generally, the steep time for a French press is 4 minutes, the water temperature for steeping coffee is set at 88°C-91°C, and the coffee grounds are ground relatively coarse. Because the glass body of the French press does not retain heat for very long, the water temperature will continuously drop during the steeping process. At the same time, the coffee particles are coarser, so the coffee's flavor substances are released slowly. Four minutes is the optimal steep time for making coffee with a French press, but do not exceed 6 minutes. After the 4-minute steep is finished, press down the filter, and then pour the coffee into another container before tasting.

What are the characteristics of coffee steeped in a French press ?

Compared with drip-style pour-over coffee, immersion-style French press coffee has a richer and fuller body!

The French press filters coffee grounds through a metal mesh, and the pore size of the metal mesh is larger than that of ordinary filter paper. During filtration, it can retain most of the coffee oils. Front Street has noticed that coffee made with a French press has a thin layer of oil on top; while the pour-over coffee we commonly see is made by pouring water through the coffee grounds layer and high-density filter paper. When the coffee liquid passes through the filter paper, most of the oils are filtered out, and the coffee clearly feels much cleaner when it comes out. Although it is richer and fuller than pour-over coffee, due to the design of its metal mesh, it also retains many fine coffee grounds. It is also quite common to end up drinking coffee grounds at the bottom of a French press.

2. Coffee steeped in a French press better highlights the coffee's most original taste

The extraction mode of the French press is similar to cupping; both are immersion extraction. The advantage is that it minimizes human influencing factors and best reflects the bean's most original taste, and the coffee's flavor is also more concentrated. What are human influencing factors? For example, in pour-over coffee, the height and speed of pouring water can change the expression of the coffee's flavor, or brewing with different drippers also produces different flavor expressions. But this does not apply to the French press. Only three things can affect the flavor of coffee made with a French press: grind size, water temperature, and steep time.

How to use a French press to make coffee?

For this brewing, Front Street selected Costa Rica Musician Series Mozart coffee beans. This is a coffee with a dried-fruit fermented feel, white floral notes, and an obvious sweet-and-sour taste. The brewing parameters are as follows:

Coffee dose: 15 grams Coffee-to-water ratio: 1:15 Grind size: medium-coarse grind (68% passing rate on a No. 20 standard sieve) Water temperature: 90°C Steep time: 4 minutes

First, preheat the French press with warm water, then discard the warm water. Pour the ground coffee into the French press. The grind should be slightly coarse, then pour in 225 ml of hot water (90°C). The pouring can be done with a somewhat larger flow (finish pouring in about 3 seconds), letting the coffee grounds tumble to improve extraction efficiency. After pouring is complete, pull up the filter, put on the lid, and steep for 4 minutes. After 4 minutes, gently press down the plunger to about 1/4 of the way down the body, avoiding fine grounds at the bottom surging upward. After pressing down, pour out the coffee liquid and enjoy.

Yes, the operation of making coffee with a French press is just that simple. How does Mozart coffee made with a French press perform in terms of flavor?

After the coffee is poured out, Front Street smells a rich raisin fermented note. On the palate, there is a berry juice-like quality, orange blossom aroma, an obvious fermented feel, and a pineapple-like sweet-and-sour taste.

The above content is compiled by CoffeeHunters, a coffee news website.