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Your sandwich can become a masterpiece with the add-ons. Produce that is cruciferous, crunchy and filled with fluid will help fill you up and add bulk to the mix. Consider apple slices, mushrooms, spinach or the combo. Of course, tomato is also a good choice.
And if by chance you want more protein, think about rinsed can tuna or a few slices of deli meat to help keep you fuller longer.