0: https://coffeefaq.com/many-ounces-shot-espresso/
1: https://www.seattlecoffeegear.com/learn/videos-home/ask-the-...
2: https://coffeefaq.com/just-how-much-ground-coffee-do-i-need-...
On coffee methods the standard is 1 gram coffee to 17 grams water, with some flexibility for brew strength preference.
The only places that use tradional ratios are old school Italian influenced shops, which are fewer and farther between.
I found them by chatting to a local coffee roaster and getting the name off them. It’s often written on the coffee sacks too.
I know it’s a different country but if you wanted advice, a friendly email to them might serve you well. They are a great company.
They sell by the kg to me and have often chatted about how they work. Road trips around various countries with a grinder and espresso machine - sounds fun.
Green microlots from Colombia and Honduras, available in the USA.
I haven't purchased from them and am not sure how the pricing compares to other producers but it's a cool project.
That price per kg is also not very reflective of what you pay for ok-good coffee if you are buying green beans from an importer. The current batch I have is sold to me from the importer who buys direct from the farmer.