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The number two Mexican fast food chain nicely duplicates the delicious fish tacos you'd find in coastal towns south of the border: two corn tortillas wrapped around a fried halibut fillet that's topped with cabbage, fresh salsa, and a creamy "secret sauce." It's practically impossible to eat just one—they're that good. And, thanks to the availability of breaded frozen fish sticks in just about every market, a home clone is stupidly simple. If you can't find crispy halibut sticks in your local store, the more common breaded pollock will work just fine here. You can also use frozen fish portions that are grilled if you're not into the breaded (fried) stuff. The real recipe at Del Taco comes with two thin corn tortillas, but sometimes the only available corn tortillas in consumer markets are the thicker ones. If that's the case, you'll need just one per taco.
Source: Top Secret Recipes Unlocked by Todd Wilbur.