Beef Stroganoff with Gherkins

I went to Ruse last weekend and I tried a similar dish and it was quite tasty, so I tried and recreate it.

Here it is:
 

600g topside beef, 150g fresh mushrooms, 2 tablespoons oil, 3 big onions, sliced, 1/2 teaspoon sweet paprika, 2 cups (500ml) beef stock, 1 cup (250ml) cream, 5 small pickled gherkins, 1 pinch salt and freshly ground pepper, to taste, fresh parsley

Cut the beef into fine strips. Clean the mushrooms and cut into thin slices.
Heat oil in a large saucepan. Sauté beef over a medium-high heat turning from time to time. Remove from the saucepan and set aside.
Fry the onions and mushrooms in the beef dripping. Add the meat, paprika, beef stock and cream. Season the sauce with salt and pepper. Let them boil till only half the sauce remains.
Slice the gherkins and add them to the saucepan. Add the chopped parsley and serve.