Start with the preparation of the potatoes: wash them well, cut the ends and finally to strips.
Fry the potatoes in seed oil and salt. Set them aside.
To make the sauce, mix the low-fat yoghurt with mayonnaise, turmeric, green pepper and dill.
Cut the Roastbeef into thin slices and place it on the plate.
Add the yoghurt sauce and the sweet potatoes as an accompaniment.