Peel and wash the potatoes, turnip and carrots. Cut the potatoes into large pieces, the carrots into thick slices and dice the turnip into medium-sized pieces.
Dice the onion and fry in the oil until translucent. Add the potatoes, turnip and carrots and stir-fry. Season with salt, pepper, thyme and bay leaves. Pour in about 1 1/4 liters of water and bring to the boil. Stir in the granular broth and cook everything covered over a medium heat for about 30 minutes.
Wash, pat dry and chop the parsley. Season the stew with salt, pepper and Worcester sauce to taste. Serve sprinkled with parsley.