For The Love of Hops: The Practical Guide to Aroma, Bitterness and the Culture of Hops

What is the difference between a burr grinder and a blade grinder for espresso?

A burr grinder crushes coffee between two abrasive surfaces to produce consistently sized particles — essential for espresso. A blade grinder chops randomly, producing a mix of fine dust and large chunks that extract unevenly and make good espresso nearly impossible. Never use a blade grinder for espresso. For pour over and drip, blade grinders are tolerable; for espresso, a burr grinder is a non-negotiable requirement.

How do I steam milk properly for lattes and cappuccinos?

To steam milk: fill the pitcher to the bottom of the spout, purge steam wand briefly, submerge tip just below surface, open steam fully and create a vortex by angling the pitcher. In the first 5–8 seconds, keep the tip near the surface to introduce air ("stretching"). Then submerge fully to spin and heat the milk to 65°C (150°F). Tap the pitcher and swirl to break up large bubbles. Good steamed milk should look glossy and feel like wet paint.

What is microfoam and why does it matter for latte art?

Microfoam is steamed milk with very fine, velvety bubbles — almost indistinguishable from liquid, with a shiny, paint-like appearance. It's created by introducing a small amount of air at the beginning of steaming and then integrating it fully. Microfoam pours smoothly and allows latte art because the foam flows with the liquid. Coarse, bubbly foam (macrofoam) creates cappuccino texture but won't pour into art patterns.

Why does water quality matter so much for espresso?

Water makes up 90%+ of your espresso. Water that's too soft (low mineral content) is corrosive and under-extracts. Water that's too hard builds limescale in your machine and over-extracts bitter compounds. The SCA recommends water with 75–150 ppm TDS, low chlorine, and near-neutral pH. Hard tap water is the most common cause of premature machine failure — it's worth addressing with filtered water rather than hoping for the best.