There is a version of San Diego food writing that stops at the 8 freeway. Ignore it. Chula Vista and the surrounding South Bay have the county's deepest concentration of Mexican and Mexican-American cooking, and almost none of it needs a reservation, a tasting menu or a hundred-dollar bill.
Start with mariscos, not tacos
The single most underrated category in the city. South Bay mariscos counters do aguachile, ceviche tostadas, shrimp cocktails and whole fried fish at prices that would be a rounding error downtown. Lunch is the right meal for it — most of these places are at their best before three.
If you order one thing: an aguachile verde with saltines and a cold Mexican lager. If you order two: add a tostada de ceviche.
Then the taquerias
Al pastor off a vertical trompo is the benchmark. If the trompo is visible from the street and there's a line at 9 PM, you're in the right place. Asada, adobada, cabeza and lengua are all standard; the salsa bar tells you more about the kitchen than the menu does.
Birria has taken over the last few years — the quesabirria with consommé is genuinely good here, not just a trend import.
Pan dulce and breakfast
Panaderías along Broadway and Third Avenue open early and sell out of the good stuff by mid-morning. Conchas, orejas, empanadas — grab a tray and tongs, load up, pay by the piece. It's the cheapest good breakfast in the county.
Beyond Mexican
Chula Vista's Filipino food scene is significant and often overlooked, particularly on the east side and along the Palomar corridor. There are strong Vietnamese, Japanese and Middle Eastern kitchens through the city as well, plus a growing cluster of independent breweries and coffee roasters downtown.
Where to eat by neighborhood
Downtown and Third Avenue: the densest and most walkable — best for a food crawl on foot.
Broadway corridor: strip-mall exteriors, serious kitchens. Do not judge by the parking lot.
Eastlake and Otay Ranch (91914/91915): newer, patio-heavy, better for families and groups.
Bayfront: seafood with a view, priced accordingly.
Practical rules
Cash still moves faster at counters. Peak hours are 12–2 and 7–9. Many of the best places close between lunch and dinner. And if a place has been open twenty years in the same strip mall, that is the review.
The short version
Eat mariscos at lunch, tacos at night, pan dulce in between, and stay off the freeway-adjacent chains entirely.