title_body: What's the optimal size of a moka pot for a single espresso?
upvoted_answer: I figured it out. I bought a 2 cup Bialetti Brikka. It's a moka pot with a special valve. The main purpose of the valve is crema formation. It's also a bit easier to use than a regular moka pot:
  
  
  It is designed to start with cold water. Just use the exact amount (there is a measure) not more, not less.
  It streams coffee for only few seconds and you don't have to play with the heat intensity while brewing. 
  The brewing occurs at higher pressure and temperature - thus stronger coffee.
  And yes, decent crema!
  
  
  I get exactly one full espresso cup of strong and nice tasting coffee.