California Fish Grill in the Target plaza on Barranca. There's a number of choices in the University Center, my favorite being the Veggie Grill (yes, it's vegetarian but very good). I also noticed that there's quite a variety of food to go inside of Wholesome Choice on Culver and Michelson
You can go to the new Whole foods market in tustin. They have lot's of selection, from pizza to salad,soup,smoked meat,fish,grill and lot's more. The only problem is the parking.