Philly Cheese Steak - cooking recipe

Ingredients

3 tablespoons olive oil
1 onion, sliced
1 green pepper, sliced
1 lb mushroom, sliced
1/4 cup pepperoncini pepper, sliced (or pepperoncini)
1 lb deli roast beef, sliced
3 teaspoons fresh oregano, chopped (or 1 teaspoon of dried oregano)
kosher salt
pepper
4 -6 hoagie rolls
8 slices provolone cheese (Cheddar works well too)
HORSERADISH SAUCE
1/2 cup sour cream
1/4 cup prepared fresh ground horseradish (comes in a jar, kept in refrigerator)

Preparation

Preheat oven to 500 degrees Fahrenheit.
Heat 3 tablespoons of olive oil in large saute pan, over medium high heat, add onion; saute 10 minutes until golden.
Add green or red pepper, mushrooms, and pepperoncini to pan; continue to saute another 5 minutes until browned.
Slice roast beef into 1-1/2 inch strips.
Turn heat to medium; add roast beef strips to the vegetables.
Add oregano and salt/pepper to taste; stir-fry all together 3 to 5 minutes.
Place mixture on 1/2 of opened hoagie rolls on a lined baking sheet.
Top each half with two slices of provolone cheese.
Cook in oven until roll is toasted and cheese is melted.
HORSERADISH SAUCE:
Mix sour cream and horseradish sauce together in bowl.
After sandwiches are prepared, right before serving, drizzle sauce on top or slather on.