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Caffeine extracted depends on both bean mass and extraction time. More on bean mass. Don’t go long to get caffeine. You’ll just get the bitter flavors. More caffeine? Have a second double.
If you underdose your basket the water from brew group will disrupt your puck and you will get fast underextracted shot. And a soupy puck.
Espresso dose is classically 2 oz (56 grams) from a 14 gram shot. That’s classic Italian. But we are here in the USA and are working in third and even fourth wave coffee. Just because the Italians invented espresso doesn’t mean they have it perfected. There’s always room for experimentation and improvement, especially given personal preference. I prefer a 18 gram bean dose to provide a 30 gram shot in 25-40 seconds (depending on coffee varietal) after a 25 second preinfusion. I have no blonding.
Jon
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