Cut the steak into 2.5 cm/1 inch strips.
Heat the oil gently in a shallow pan and lightly brown the meat.
Drain off the excess fat.
Slice the gherkins and add them to the pan with the Tomato and Onion Cook-in-Sauce.
Bring to the boil, stirring constantly.
Cover and simmer for 20 minutes, stirring occasionally.
Serve hot, garnished with swirls of soured cream and chopped parsley.