Pour one glass of meat broth into a saucepan. Add a soup spoon of butter, the lemon juice and the cleaned mushrooms. Boil for 10 minutes, then drain, but save the cooking water. Melt a soup spoon of butter in another saucepan. Cut the meat into small pieces and add it to the butter. Add the onion, a little pepper and cook 4-5 minutes on a high heat. Add the tomato sauce, two glasses of water, and the liquid in which the mushrooms were cooked. Cover and cook until the meat is very tender. Add the mushrooms, cook a few moments, then put aside.

Boil the noodles in salted water. Drain them well, place in a serving dish, pour 4 soup spoons of melted butter over them, then the prepared sauce. Mix and serve at once.