Clean and wash the cauliflower and divide it into small florets. Clean and wash the beans, peel and wash the carrots. Cut both into bite-sized pieces. Put vegetables in 1/2 litre of boiling salted water.
Cover and cook for about 8 minutes, drain. Keep the stock. Clean, wash and dice the aubergine and sprinkle with salt. Peel onions and ginger and dice finely. Peel garlic and press it through a garlic press.
Heat the oil. Fry onions, ginger, garlic and eggplant in it while stirring. Sprinkle with curry and sugar. Add vegetable stock, bring to the boil briefly. Add pre-cooked vegetables, cook for 4 minutes.
Stir yoghurt and starch until smooth and add to the vegetables. Bring to the boil again and season to taste.