I see what you mean. I checked out the link. It sounds like it originated in the UK, as some of the ingredients were listed in grams, as opposed to TBS. or cup fractions. Looking over the other recipes, I'm even more sure that the no stands for number. Like with the chili's and the onion, it said 1 no: which I would say is telling you the number to use, just not the way we're used to seeing it stated.
I know I used to watch the cooking channel alot and I loved the naked chef, but again he is from the UK and I sometimes had trouble converting his measurements into cups, TBS. and tsp. I had to tape all of his shows so I could play them back and pause to do the conversion.
Well anyway I think we know now why wev'e never seen it like that before in any of our cookbooks. Have fun and just use the no (number) it calls for and you should be ok.