Extraction mostly depends on water pressure, water temperature grind, and tamp. Ideally, it should take 18-28 seconds to pour 1.5-2oz. Its appearance should be a cinnamon brown and uniform in color. If it's bubbly and has dark spots, this indicates that the water is too hot. If it only shoots .5oz the grind is too fine. If it could fill a 12oz cup, the grind is too coarse.
The caffeine content of a two ounce espresso is roughly 80mg. An 8oz cup of drip coffee has around 100mg. This figure varies depending on brew method. Espresso consists of three parts. In a cup, it would be the bottom, middle, and top. The base is the bottom and the “heart” of the espresso. It contains soluble particles suspended as viscous liquid. The moving part, called the suspension, settles like a Guinness beer. The top, called crema, is created by the dispersion of gasses, air, and carbon dioxide into liquid at high pressure. The emulsified oils form a foamy texture on the surface.

Espresso blends differ depending which coffee house you visit. At FreshCoffeeNow, I try to keep ours mellow and rich. I've played around with a bunch of different coffees blended in different ways. Now I have a simple blend which I think best suits my taste. Our espresso blend is very full-bodied and syrupy with a smooth bourbon and chocolate flavor.
