For the steak filling
01 -
1 1/2 lb (680 g) ribeye steak, chilled and sliced very thin
02 -
1 1/2 tablespoons neutral oil, divided
03 -
1 large yellow onion, thinly sliced
04 -
1 green bell pepper, thinly sliced, optional
05 -
1 teaspoon kosher salt, plus more to taste
06 -
1/2 teaspoon black pepper
For the sandwiches
07 -
4 hoagie rolls or sub rolls, split but not cut all the way through
08 -
8 slices provolone cheese, American cheese, or 3/4 cup warm cheese whiz
09 -
2 tablespoons unsalted butter, softened, optional for toasting rolls
10 -
Hot cherry peppers or pickled jalapenos, optional for serving