Preheat broiler with oven rack 5 1⁄2 inches from heat. Cut tomatoes in half. Spread cut sides with mustard; sprinkle with salt, black pepper, and red pepper.
Place tomato halves on oven rack. Combine butter, breadcrumbs, and cheese. Spoon crumb mixture on top of each tomato half.
Broil 2 minutes or until crumbs are golden brown and tomatoes are thoroughly heated.
Notes
To boost flavor, toss breadcrumbs with finely chopped fresh basil or your favorite fresh herb.
* If nutritional values are provided, they are an estimate and will vary depending on the brands used. The values do not include optional ingredients or when ingredients are added to taste.
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