Start by slicing the onions, mushrooms, and the steak into strips.
Heat the oil in a pot over medium heat, then add the onions and saute along with the mushrooms until soft and tender. Add the steak strips and saute until browned.
Add water, beef stock cube, the bay leaf, salt and pepper. cover and simmer for 30 minutes.
Minutes before the cooking is done, add the heavy cream (at this point you can add uncooked pasta if you wish), give it a stir and close the lid. You can also add the cream along with all of the other ingredients, but I usually add it before the last 10 minutes.