Preheat oven to 350°. Without separating rolls, cut each package of rolls horizontally in half; arrange bottom halves in 2 greased 13x9-in. baking pans. Sprinkle each pan of rolls with 1 cup cheese. Bake until cheese is melted, 3-5 minutes., In a large skillet, cook beef and onion over medium heat until beef is no longer pink and onion is tender, breaking beef into crumbles, 6-8 minutes; drain. Stir in tomatoes, mustard, Worcestershire sauce, salt and pepper. Cook and stir until combined, 1-2 minutes., Spoon beef mixture evenly over rolls; sprinkle with remaining cheese. Top with bacon. Replace tops. For glaze, in a microwave-safe bowl, combine butter, brown sugar, Worcestershire sauce and mustard. Microwave, covered, on high until butter is melted, stirring occasionally. Pour over rolls; sprinkle with sesame seeds. Bake, uncovered, until golden brown and heated through, 20-25 minutes.