
Originally Posted by
tgapp
jm2e's and doremite's advice is super fucking sound, all of it. 100%, all very well put. frorider too!
does your machine have a pressure gauge? the reason I ask is because most preground coffee is ground for pressurized portafilters (and it's stale) and a real machine is just gonna blow right past it. sucks for now, but in the long run you'll benefit from it. anyway, if you do have a pressure gauge it'll likely gonna show that your machine is never getting up to pressure.
in addition to the advice about timing, one of the other diagnostic tools is to watch the bottom of the portafilter basket as you pull a shot - something I still do every day. here's how it works: you turn your machine on and it'll take N seconds (6-15 or so, also depends if you have preinfusion capabilities). during that time you'll hear the pump kick on and the sound changes when it reaches pressure (helpful if you don't have a pressure gauge). watch the bottom of the basket now; it should saturate uniformly across the bottom at about the same speed (looks like it's sweating chocolate), then it'll drip randomly, and then the drips will coalesce into a stream. once you're at the stream stage, it should look like a tiger's strips with light and dark bands spaced evenly around the cone.
eventually, the dark stripes will grow lighter, until the entire cone is cappuccino colored. if you look in the demitasse, there will be a markedly lighter splotch of crema where the stream enters. this is called blonding, and it happens when the espresso is over extracted - why shots end up tasting bitter. the trick is to kill the shot as soon as it starts to blond - and if you're blonding before 25 seconds or so (some would say 20 seconds to but imo nothing good ever comes out before 27 seconds), something is not right. grind finer, dose higher, tamp harder, etc.
shot weights and ratios are great as a baseline, but they also tell you nothing about the espresso other than bare functional metrics. arguably the world's greatest professional coffee expert (scott rao) drinks his espresso 3:1 and says, hands down, it's the best in the world, and i totally believe him. so, my advice is to try and shoot for a particular metric but then pay attention to how the shot progresses too.
one more thing about cheap beans: I agree with this sentiment but if you are using really cheap beans they won't pull well - they're too stale to cause the necessary swelling that creates a proper puck (and not a soup mess). so you need cheap, properly aged beans (5-10 days off roast), because otherwise, you won't be able to learn much about shot mechanics.
i'm happy to supply you with cheap espresso (i've got buckets of cheap green that would be great for this) if you want some, it'll just take 5-10 days to age before it's good to go. and once you've got that figured out, i'll share some dope beans with you too
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