Yes, Yes, of celery. No there is no typos. I found this recipe in another cookbook, downloaded from the Internet, and since I love all very unusual, the past could not pass. I agree that celery is a completely unexpected ingredient for jam. But it is, in its own way, delicious and interesting. For those who are not afraid of experiments. And taste of celery is not felt (probably due to the lemon and anise). I myself don't really like celery (just eating it in a salad with chicken breast), and even here very much.