thanks cliveb for your input... its nice to see this thread revived and so many posts today! chimichurri IS indeed a great sauce and is crucial for any argentinian "bbq" or grilling outing... while more commonly used for steak, it works well with chicken as well... cliveb, after you mentioned the ceviche i began thinking "oh my god" how many people may have actually used yellow lemons in making ceviche!! no, no, no!!! perhaps in the chimichurri you can get away w substitution, but in ceviche where basically the lime juice IS the ONE crucial ingredient other than your fish?!?
btw, the "limon criollo" is more akin to the key limes in florida than the so called "persian limes" which are very similar looking to yellow lemons but green in color.... limon criollo has a lot of juice for its size and a very thin skin and rind