Brown the onion pieces in the pan for 5 minutes, then add the butter and garlic, sauté for another 2 minutes. Add the celery and kale, deglaze with the vegetable stock and simmer on a low heat for about 15-20 minutes until the water has largely evaporated. The pumpkin should be added 5-10 minutes before the end, depending on the consistency. Finally, season with soy sauce, honey and pepper.
The vegetables go very well as an accompaniment to fish dishes!