Clean the cauliflower and cut into small florets. Peel and dice the celery, potatoes and onion.
Heat the oil in a pan, fry the onion with the chilli and sprinkle with curry and turmeric. Add sugar and tomato paste and let caramelize. Add the cauliflower, potatoes and celery and mix all ingredients together thoroughly. Briefly sauté the vegetables and deglaze with the stock. Add the raisins and simmer the curry in a closed pan for 20 minutes.
Cut the banana into half slices, add to the pan and simmer the curry for another 10 minutes. Add the cream and season the curry with salt, pepper and a little lemon juice.