1st part mostly OT…
If I ever open any kind of food joint, I’m going to serve an Enigma Taco. 
On topic
I knew a guy who was really into them (i.e. bought them hook, line and sinker, IMO). I think I tried reading one of his books once… I don’t remember getting very far into the book. Nor trying very hard for that matter. 
Take care,
Derek