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STEP 1: Remove Bones, freeze the meat until firm around edges but still yielding in center 45-60 minutes. This makes it easier to slice.
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STEP 2: Slice semi-frozen meat as thin as possible. Slices do not have to be regular. Divide into 8 portions. Meat can be prepped 1 day ahead, covered tightly and chilled.
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STEP 3: Saute Peppers & Onions
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Heat Olive oil in large pot over medium high heat
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Add Onions & Peppers and season with S & P.
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Cook stirring often, adding a splash of water if vegetables are browning too quickly.
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Cook until golden & tender, about 25-30 minutes.
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Remove pot from heat
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Add vinegar & stir.
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Taste & adjust seasoning
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This can be done ahead; cooled, covered, chilled and reheated before assembly.
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STEP 4: GET COOKING
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Slice bread in half lengthwise
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Heat a large griddle across two burners on medium heat (Or use large cast iron skillet)
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Lightly coat cooking surface with vegetable oil
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Place two portions of meat on griddle (about 1 Lb.)
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Season generously with S & P
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Cook, pressing down and pulling slices apart using two metal spatulas until cooked halfway thru (you should still see some raw spots.)
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Scoot meat into 2 oblong portions no more than 1" high
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Top with onions & peppers
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Top with 2 slices each of the two selected cheeses
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Cook, undisturbed until meat is browned and crisp underneath and cheese is melted, about 4 min
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Transfer to roll, slice & serve