Boil the potatoes in their skins, rinse and peel. Cut into 2 cm cubes. Finely chop the parsley and spring onions. Mix with the potatoes.
For the sauce, mix the tahini with lemon juice. Add yogurt and stir well. Season to taste with salt and a little cumin. Carefully fold the sauce into the potato and parsley mixture.
Tip: If you like, 1-2 crushed cloves of garlic are also good in the sauce.