2 vidalia or other sweet onions, sliced
4-6 salmon steaks (or any fish of your choice)
1 pound portobello mushrooms, sliced
Juice of one lemon
Fresh herbs of your choice (optional)
Lemon wedges for garnish
Freshly ground black pepper to taste
Preheat oven to 350 degrees. Place a layer of onion slices on the bottom of a casserole with a tight-fitting lid (large enough to hold the fish steaks in one or two layers.) Place the fish steaks on the onions, then arrange the mushrooms and remaining onion slices on top. (If you are using two layers of fish, place some of the mushrooms and onions between the layers and the remaining ones on top.) Lay the fresh herbs on top, if you are using them; and squeeze the lemon juice over all. Cover and bake 30 minutes, or until the fish is opaque in the middle (test with a knife or fork.) Serve with lemon wedges and pass the pepper mill.