1. Sear the meat in a little unsalted butter until the pieces are slightly golden.
2. Sprinkle with 2 tablespoons of flour. Stir well.
3. Add 2 cups of water, bouillon cubes, wine, and stir. Add more water if necessary to cover.
4. Slice the carrots into rounds and finely chop the onions, then add them to the meat along with the mushrooms.
5. Simmer over very low heat for about 1 hour 30 minutes to 2 hours, stirring occasionally.
6. If necessary, add water from time to time.
7. In a bowl, mix together the heavy cream, egg yolk, and lemon juice. Add this mixture at the last moment, stir well, and serve immediately.