Clean and wash the spinach thoroughly or let the frozen spinach drain well.
Peel the onion and garlic, core and rinse the chillies, peel the ginger and dice everything finely. Mix with the coriander and cumin.
Heat ghee or clarified butter in a wok or high-walled pan. Sauté the onion, garlic, chilli, ginger and coriander in it and add the curry, salt and sugar. When everything has mixed well and smells intensely, add the drained spinach and let it collapse, turning carefully. The spinach leaves should combine well with the spices.
Finally stir the yoghurt into the spinach. Roast the sesame seeds in a dry pan without fat and sprinkle them over the spinach.