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2½ hours before cooking, transfer the marinating beef to the freezer to harden. Remove the beef from the freezer after 1 hour.
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Lay the firm beef on a cutting board and with a sharp knife, slice the beef into thin strips. Put the sliced beef into a bowl.
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Peel and cut the onion into thin rounds and add it to the bowl with the beef. Cover the bowl and return the bowl to the refrigerator to thaw. 30 minutes before cooking, remove the bowl from the refrigerator, keeping it covered, let the beef thaw the rest of the way while preparing the rest of the ingredients for the sandwich.
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Cut the hoagie rolls 3/4ths of the way through lengthwise, lay out the cheese, and take out the pickled peppers to have them ready before cooking the meat.
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Heat the olive oil in a sauté pan over medium-high heat. Add the sliced onions and cook 2-3 minutes.
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Add the beef slices to the pan, in batches if necessary, in a single layer and cook 4-5 minutes, stirring to keep them from sticking to the bottom of the pan as they cook and to mix them with the onions.
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When the beef is almost done, lay a slice of the cheese on each portion of meat. Spread the mayonnaise on the inside of the bread and lay it open on top of the cheese. Allow it to cook 2 more minutes and, using a spatula, pick up the sandwich and close the bread around the meat.
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Transfer the sandwich to a cutting board and top it with the pickled peppers. Serve immediately.