1 tablespoon olive oil
1 softball-sized onion, chopped
1 green pepper, chopped (optional)
1 pound ground beef
2 tablespoons steak sauce, such as A-1
1/2 cup beef stock
Salt and ground black pepper
4 dinner rolls or package of hamburger buns
Cheese sauce (see below) or just use sliced provolone on top
1 tablespoon butter
1 tablespoon flour
1 cup milk
1 cup shredded provolone
In large skillet over medium-high heat add the oil. Add the onion and green pepper and cook until soft and starting to brown. Add the ground beef and cook about 5-6 minutes. Drain off the fat, then stir in the steak sauce and beef stock, season with salt and pepper, bring to a boil and cook about 2 minutes.
Toast the rolls and set aside.
If making the cheese sauce, melt the butter in a medium-size pot over medium-high heat. Stir in the flour and cook about 1 minute. Whisk in milk, bring up to a bubble and let thicken, about 2 minutes. Turn off heat and stir in the cheese.
To serve, place a scoopful of the meat mixture onto the bottom of the rolls, then top with the cheese sauce or slice of provolone and replace the top of the roll.