I got this recipe from the local HEB, and tried it last night. This is unbelievably easy, but damned good.
1 to 1-1/2 pound tilapia filets
2-3 cups sliced mushrooms
10 oz. fresh spinach (one bag of baby spinach works if you're lazy)
1/2 red onion, thinly sliced into rings or half-rings
One small bottle of soy ginger sauce (you'll end up using most or all of it)
Preheat oven to 450.
Rip off 4 sections of aluminum foil, 12X18" or so. Divide the fish equally and place in the center of each square of foil. Salt & pepper the fish. Divide the spinach, mushroom and onion and pile on top of each fish portion. Douse each pile with 2 tbsp soy ginger sauce. Close up each foil packet (fold them over to seal lengthwise, then bring up sides; this should keep them shut).
Put the 4 packets on a large cookie sheet and bake at 450 for 8-10 minutes. I did it a bit longer because I'm paranoid, and it didn't dry them out or anything.
Take out, dump the contents of packets into bowls or plates, and serve immediately. Careful opening the packets as they will be steamy.
Friggin' fantastic. I forgot to make rice to go with them, but they were fine without it.