1. In a nice pressure cooker with a valve, sauté the sliced onions in a little butter and oil, along with crushed garlic and chopped parsley, then brown the meat on all sides for a few minutes.
2. Add a tablespoon of sugar, salt, plenty of pepper, herbs, thyme, and bay leaf.
3. Add enough broth from two cubes to cover the meat with liquid.
4. Taste the juice and adjust with salt or pepper if needed...
5. Add peeled and quartered turnips, as well as potatoes and carrots.
6. Add 2 glasses of water. Close the pressure cooker.
7. Cook for 40 minutes after the valve starts releasing pressure.
8. Open the pressure cooker, remove the potatoes and turnips, and mash them with a potato masher or fork, adding a little cooking liquid.
9. Serve this puree with the meat and carrots.