1 teaspoon paprika
Lightly salt and pepper flank steak. Spread one side with mustard.
To prepare stuffing, heat vegetable oil in a fry pan, add onion and cook for 3 minutes, until lightly browned. Add mushroom pieces; cook for 5 minutes. Stir in parsley, chives, tomato paste, and bread crumbs. Season with salt and pepper and paprika.
Spread stuffing on mustard side of the flank steak, roll up jelly-roll fashion and tie with thread or string.
