Jalisco-Style Fish in Sauce

Years ago, while I was studying in Guadalajara, I experienced for the first time one of the great treats of going to the beach at Puerto Vallarta—eating freshly caught local fish, threaded on sticks and grilled over an open fire on the beach. The fish are quite large and served simply with bottled red chile sauce and lime. The flavor stayed with me and I developed this refreshing, lively sauce—though how much of the present recipe is my own invention and how much I gleaned from now-forgotte