Lunch insiders confirmed rumors Monday that Mayonnaise and Black Forest Ham would share top billing in a highly anticipated upcoming sandwich, which sources said is still in the early stages of development. The on-bread reunion will be the first time the popular duo has teamed up since costarring in a widely acclaimed Italian grinder in 2009. Recent kitchen reports stated that the sandwich itself was almost abandoned when it appeared that a prior commitment to star in a low-budget chicken salad might have rendered Mayonnaise unavailable. Sources would not confirm rumors that Shredded Lettuce and Melted Provolone are also involved, but confirmed that, despite early interest, Ketchup just wasn't right for the project. 