Cut tomatoes in half crosswise. Blot excess moisture from tomatoes with paper towels. Spread mustard over cut side of tomatoes. Sprinkle with salt and pepper. Combine remaining ingredients and mix well. Spoon bread crumb mixture over tomato halves. Place tomatoes in shallow baking dish. Bake at 350 degrees for 5 to 6 minutes. Then broil until lightly browned. Yield: 8 servings.