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Today alongside the pierogi , the sausage is served on a long roll with mustard like a hot dog or as a Maxwell Street Polish , a sandwich that has caramelized onions as an essential ingredient .
 Maxwell Street Polish
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:
 Maxwell Street Polish