An old deli in Sayville/Bayport area made a "Black Forest"... roast beef, on Italian hero bread, with garlic butter, mozzarella cheese, BBQ sauce and bacon
Also love the Blimpie Best, with extra Oil and Vinegar... something no one else seems to recreate.
Crickets, in Sayville before they closed made a "Tex-Mex" sandwich, which was French Dip, with Jalapeños, and cheddar cheese.