In A Bowl, Combine The Water And Lemon Juice. Add Fish; Soak For 5 Minutes. Drain And Place Fish In An 11-In. X 7-In. X 2-In. Baking Dish Coated With Nonstick Cooking Spray. Sprinkle With Pepper. Layer With Onion, Tomatoes And Green Pepper. Combine The Remaining Ingredients; Sprinkle Over Top. Bake, Uncovered, At 375 Degrees F For 20-30 Minutes Or Until Fish Flakes Easily With A Fork.