Manual Brew Methods & Ratios

The core how-and-why engine of the site: each immersion or percolation method taught as a set of controllable variables — dose, brew ratio, grind size, water temperature, agitation, contact time. Articles show what changes in the cup when one variable moves, pair with the brew-ratio and water calculators, and treat head-to-head method questions as extraction problems (flow-rate vs. steeping, filter vs. mesh) rather than taste opinions.