French Press (Plunger Pot)

The French press is a full-immersion brewing device consisting of a cylindrical glass or stainless-steel vessel and a plunger fitted with a stainless steel mesh filter disc. Coarsely ground coffee steeps in hot water for approximately 4 minutes before the plunger is pressed down, physically separating the grounds from the brew. Because the mesh filter allows oils and fine particles to pass through — unlike paper filters — the resulting cup is notably full-bodied, rich, and slightly turbid. The origin of the design is disputed between France and Italy, but the first widely recognised patent was filed by Italian designer Attilio Calimani in 1929. A relevant health note: French press coffee contains cafestol, a diterpene compound that raises LDL cholesterol when consumed in large daily quantities.

Background & Context

The French press (cafetière à piston in French) is a full-immersion brewing device consisting of a cylindrical glass or stainless steel vessel and a plunger fitted with a metal mesh filter. Coffee grounds steep in hot water for 3–5 minutes before the plunger is pressed to separate grounds from brew. The device's invention is attributed to a French patent filed by Mayer and Delforge in 1852, though the modern commercial design was developed by Italian designer Attilio Calimani in 1929. Unlike paper-filtered methods, the French press's metal mesh allows coffee oils, fine particles, and melanoidins to pass into the cup — producing the characteristic full body and slightly turbid texture that paper filters exclude. This also means the French press delivers higher concentrations of cafestol and kahweol (coffee diterpenes associated with LDL cholesterol elevation) than filter coffee.

Practical Use

French press brewing rewards attention to grind coarseness and timing. Recommended parameters: 60–70g coffee per litre of water (1:15 to 1:14 ratio), water at 93–96°C (just off boil), coarse grind (similar to coarse sea salt), 4-minute steep. The common mistake is using too fine a grind, which produces an over-extracted, bitter cup with thick sediment that clogs the filter and is uncomfortable to drink. After pressing, pour immediately — leaving brew in contact with grounds beyond 4 minutes continues extraction, producing bitterness. For clarity improvement, try the "plunge and pour" technique: press only halfway, pour immediately, and avoid drinking the final 20–30ml of sediment-heavy brew from the bottom.

Related Terms

Related terms: Immersion brewing, Body, Brew ratio, Grind size, Over-extraction.