Stu! This is not EXACTLY what Fermin makes! We have tried Aguachile all over and found the recipes vary from family to family, place to place! Some are not nearly as good as Fermin's - his is the best in our opinion! Fermin learned to make AguaChile from his "Tias". They own the two Aguachile stands just south (east?) of the Mayan Palace on the road to Caborca. One is called Aguachile La Torre and the other is just past it and is painted white with red trim. Can't remember the name, but it has a big Coca Cola logo painted on it. To me, they are a close 2nd to Fermin's Aguachile!!! I have also had some Aguachile in other places that is nothing like Fermin's... and not nearly as good!
I have taken copious notes and even video'd Fermin in the little kitchen of the rock casita in Lobos - just so we could try to repeat it at home! Btw, I bought a couple of the lava grinder bowls and pestles at Vasquez's up in Sonoyta. There were $20 each. Fermin got his in Caborca and told me he paid $18 each I think... Anyway - here are the notes on how Fermin does it: He first grinds up to a paste - Chile Arbols, Chile Pequens, garlic cloves and rock salt. For medium heat, he uses two of each and he also roasts his chiles before hand for the smokey flavor. Then he squeezes the lime juice and mixes that all together. Next he adds the seafood to simmer in the lime/chile sauce. He slices his shrimp and scallops - doesn't put them in whole. He also uses par-boiled octopus, carcoal (all sliced too). After about 20 minutes of soaking in the lime, he adds chilled clamato, sliced purple onion, and diced avocado. That's all! The chiles and the garlic are what dictate all the flavor and he customizes it for your tastes. I like mine kinda medium hot. I also have him add some chopped cilantro at the end to float around in mine because I love cilantro. Ted's not big on that in the Aguachile, but I am. We have made this at home and the issue there is nothing beats the sweet fresh flavor of shrimp and scallops right outta the Port of Wolves! I have also tried adding a dash of cumin to the mix and I like that too - but again, Ted doesn't. He is a purist when it comes to Aguachile de Fermin!
FYI, don't throw out any left over soup, overnight in the fridge and added to cold beer the next day is REALLY GOOD TOO!!!!!!