Add a little oil and butter in a deep pan, as soon as it starts to heat up add the roast and let it brown completely on all sides,turning it well.
Add the sage and the sprig of rosemary and leave to flavorfor 2 minutes. Add the carrots, the peeled potato, the celery stalk and the thinly sliced onion, fry, stirring for a few minutes.
Deglaze well with the beef broth and then add the hot water. Season with salt and cook for 1 to 2 hours over low heat.
Remember to turn the roast from time to time. Once ready, remove it from the broth and let it cool well and cut it into slices. Blend the broth so that it becomes creamy. Arrange the slices in a pan and add the cream base, heat the roast for a few minutes and then serve.