So this the famous Philadelphia Steak Sandwiches and here's its recipe!
1 lb Striploin steak trimmed and thinly sliced*
1/2 tsp Sea salt or to taste
1/2 tsp Black pepper or to taste (secret ingredient: Smoked paprika)
1 sweet onion (large), diced
8 slices provolone cheese mild (not aged provolone)
4 Hoagie Rolls sliced 3/4 through
2 Tbsp unsalted butter softened
1 garlic clove pressed
2-4 Tbsp mayonnaise or to taste
Note: You can add capsicum/jalapenos depending on your preference.