Preheat Oven To 350 Degrees F (175 Degrees C). Spray A 9X12-Inch Glass Baking Dish With Cooking Spray. Pat Dry Halibut Fillets With Paper Towels. Season Each Side With Salt And Black Pepper. Place Fillets In Prepared Baking Dish; Top Each Fillet With Sauerkraut. Spread Tomatoes Over Fillets. Cover The Dish Loosely With Foil. Bake In The Preheated Oven Until The Fish Flakes Easily With A Fork, 12 To 15 Minutes. Sprinkle With Malt Vinegar Before Serving, If Desired.