Prepare Garlic Sauce And Chill. Preheat Oven To 350 Degrees. Saute Onions Garlic, Oregano And Spinach Until Spinach Is Tender About 10 Minutes. Remove From Heat. Oil A Baking Dish Large Enough For Steaks To Fit Side By Side. Spread Spinach Mixture Evenly On Bottom. Arrange Steaks On Top. Drizzle With Lemon Juice And Olive Oil . Bake 35 To 45 Minutes Until Fish Flakes. Serve Each Steak On A Bed Of Spinach With Sauce On Top Of Steaks And Pass Remaining Sauce.