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Export 6 ingredients for grocery delivery
In a small bowl, mix tuna, egg, vinaigrette and, if desired, mustard. Place buns on an ungreased baking sheet, cut side up. Broil 4-6 in. from heat 1-2 minutes or until golden brown., Spread tuna mixture over buns; top with tomato and cheese. Broil 2-3 minutes longer or until cheese is melted.