lunch in Anahein tomorrow
I'm not sure about ethnic. There is a fantastic place to get fish tacos and shrimp tacos called Señor Baja in the Ralphs plaza on the corner of Weir Canyon and Serrano. In the same plaza is a very good Lebanese place called Rosine's.
You might also head west a bit and check out the food court at the Wholesome Choice market on La Palma (exit the 91 at Imperial Hwy, turn right off the exit and right at the first light onto La Palma). I personally always go to the Persian food counter but you can get whatever you like and you can sample before you buy. Cheap, too.
And a little further west than that you could go to Mas Islamic Chinese on Orangethorpe near the railroad tracks (exit the 91 at East/Raymond, turn right off the exit and left on Orangethorpe). Get the sesame bread (thin kind is better by me) and maybe five-spiced beef with leeks, or lamb dough-sliced noodles...