How do I choose coffee for a percolator?

The percolator is an old-school brewing device that works by repeatedly cycling boiling water through coffee grounds. Because this method uses high heat and continuous contact, it is prone to over-extracting the coffee, which can result in a harsh, bitter taste if the wrong beans or grind size are used. The key to a great percolator cup is choosing a coffee that can handle this aggressive extraction.

Medium-dark and dark roasts work best here. These roasts are more developed, typically offering rich, chocolatey, and caramelized notes that maintain their character even under the stress of high temperatures. A light or medium roast, which relies on delicate acidity or floral nuances, is often "lost" or made unpleasantly acidic when brewed in a percolator.

Your grind size should be significantly coarser than what you would use for a standard drip machine. If the grounds are too fine, the water will extract too much, too quickly, leading to an extremely bitter cup. A coarse grind—similar to what you would use for a French press—slows down the extraction rate, allowing you to reach a balanced strength without the unpleasant harshness that often gives percolator coffee a bad reputation.

In practice, the percolator is all about timing and heat control. Don't let the coffee boil for longer than necessary; as soon as you see the brew color you like, remove the unit from the heat. By pairing a sturdy, medium-dark roast with a coarse grind, you can move away from the "burnt" profile and toward a classic, strong, and satisfying morning cup.