Taco Tuesday: This ceviche tostada counts as a taco, right?

I went for the fish and chips and ended up with a great ceviche tostada instead. “It’s not on the regular menu, but have to try it,” says my waitress. 
Tres Muchachos is a fun new fish-and-chips bar in Costa Mesa. It’s in that same vintage strip mall on 17th Street that also houses Oak & Coal. It’s a beautifully designed space, a thin rectangular shop with a pink-on-blue-on-brass nautical theme. Tables are set with vintage silverware and a colorful mix of c