Yes, you're right Laaz, not much flesh and a pretty small lemon....but it was the first fruit.
I was given a piece of budwood, but Tintori does sell these and many other unusual varieties. On-line they sell through
www.florealia.com, but not of-course to the USA. Site navigation is a bit strange - click on the English flag then select 'citrus' in the pull-down menu of 'collections', and finally click 'go'.
Prepare to be amazed! Page after page of citrus varieties.
I have several of their plants, but not enough greenhouse space for any more.