I've just recently started making tilapia, and I've found it to be most versatile. I've been having fun making up recipes for tilapia foil packets. This one ended up my favorite (so far!). Flavors are awesome!
Heat oven to 375. Get a large piece of foil for each piece of fish. Spray well w/ cooking spray on one side.
Place a bed of spinach on the sprayed side of the foil. Lay the tilapia on top & sprinkle w/ a bit of sea salt & squeeze some lemon juice on top. Spread a generous amount of pesto on top, and then add the veggies, lemon slices, and walnuts to the packet.
Fold foil over loosely to make a packet. Bake the packets on a cookie sheet. After fish cooks about 15-20 minutes, open up the packets carefully & sprinkle w/ some fresh parmesean on top. Continue baking another 5 minutes.