Melt butter and mix in mustard, sauce and onion. Cut the entire pack of rolls in half, horizontally (keeping all top and bottom halves separately in tact). In a 9x13-inch pan, place bottom half of rolls and cover with ham and cheese. Cover ham and cheese stacks with top half of rolls. Drizzle butter mixture over top of rolls, making sure onion is evenly distributed. Refrigerate over night. Bake uncovered at 350°F for 15-20 minutes and, once finished, separate for serving. This recipe was shared by King's Hawaiian.
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