Ingredients
- 1 pound (454g) boneless rib eye steak or skirt steak or store-bought pre-sliced rib eye (see notes)1 tablespoon (15ml) vegetable or other neutral oil
- 1/2 medium yellow onion (4 ounces; 114g), cut into 1/4-inch dice
- 8 thin slices provolone cheese (about 6 ounces; 160g), 4 slices torn into 1-inch pieces and 4 slices left whole
- 2 tablespoons grated Parmigiano-Reggiano cheese (optional)
- 1 teaspoon Diamond Crystal kosher salt; for table salt use half as much by volume
- 1/8 teaspoon freshly ground black pepper
- Two 7- to 8-inch-long Italian hoagie/sub rolls, split lengthwise, but left attached on 1 side to create a hinge
Personal Notes
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