The Volkskrant interviewed Lex recently and asked him what he thought about some new research that was conducted into brewing espresso.
In a nutshell - grind courser and use less coffee. That's what they say.
It's in dutch and you can read it here!
Also made by De Volkskrant is this little film where Lex talks about how, if he had the nicest coffee in the world in his strong climbing hands, he would always make a filter out of it. But why?
Watch and find out right here! (And yes, he is holding a portafilter to make espresso but, he's talking about making filter coffee)