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Among the popular dishes introduced by the public restaurants was " kotlet mielony " " meatball " , a sort of a hamburger often served with beet puree and fresh carrots .
 hamburger
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 hamburger