Ingredients
- 2 tablespoons grapeseed oil
- 2 cups thinly sliced yellow onions
- Salt and freshly ground black pepper
- 4 tablespoons unsalted butter, softened
- Four 9-inch sub rolls
- 2 pounds shaved beef steak, such as rib-eye or sirloin
- 12 thin slices provolone
Personal Notes
Comments