Peel the turnips, wash them and, depending on their size, possibly cut them in half lengthwise. Peel, wash and slice the parsley roots. Peel and wash carrots as well. Cook the turnips and carrots in boiling salted water for 15-20 minutes.
Cook the root discs for the last 5 minutes. In the meantime, heat 1/8 litre of water. Stir in sauce powder, bring to the boil. With a low heat input, gradually add butter in flakes.
Season the sauce with orange juice. Arrange vegetables with sauce and turkey breast on a plate. Garnish as desired with orange slices and herb bouquets. Serve sprinkled with pepper.