For 2-3 servings: 1 celery root 1 onion 3 tablespoons tomato puree 1 tablespoon oil salt and pepper seitan (optional) Peel, wash and cut the celery in medium size pieces. Stir fry the  finely chopped onion, 1-2 minutes, in oil.  Add  the celery and cover with water. When the celery is almost cooked add the seitan (optional), tomato
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