Clean the Chinese cabbage and cut it into strips about 2 cm wide. Peel and finely chop the onion. Heat the oil in a pan and fry the Chinese cabbage strips in it. Season with salt and pepper. Take out and put aside. Sauté the onion in the frying fat, add the lentils and sprinkle with curry.
Deglaze with stock and simmer for 10-15 minutes. In the meantime drain the pineapple. Then cut into medium sized pieces. Wash the coriander, dab dry and remove the leaves. Add the Chinese cabbage and pineapple to the lentils about 5 minutes before the end of the cooking time. Season to taste with salt and possibly chilli, sprinkle with coriander and arrange on plates