After midnight, nothing beats grease and options. This La Frontera truck has both, offering mariscos cocktails and hamburgers out of its mobile kitchen. If you've had a long night and want something marine-light, a dependable ceviche tostada will set you back just a few bucks (and comes with chips and salsa). If you're craving a bite on the heartier side, the Sonoran hot dog — streaked with avocado sauce and mustard, smothered with beans and cheese — is one of the most underrated in town. Add potatoes to your dog if you're smart. Add a side of nachos if you're hungry. Or, you can keep things on the oceanic side with a giant shrimp and octopus burrito, or a perfectly built classic fried fish taco that goes beautifully with either of the two milder salsas.