Mook wrote:My question:
Are all espresso types extracted in 20-30 seconds?
After several years of working on it, and after digesting Jim's latest
piece, I would say that all espresso types are extracted until the blonding point. For example, try this for yourself: build an espresso, but let it flow until you get the 5-6oz for a Cafe Crema - is it any good? Now try loosening the grind so that you get a 5-6oz beverage before the flow turns white - how is it now?
My short answer would be yes, since you are less likely to get severe blonding in much less than 30 seconds unless it's a terrible pour. However, making an espresso, Americano or Cafe Crema based solely on time and with no reference to the extraction is a recipe for a bitter, overextracted beverage.
Mark