Japan has special food wich are eaten during new year.
They are zoni(a Japanese miso or sumach soup with rice cakes) and osech(special dishes for the New Year's Day).
Osech are in jubakos and they are fixed the ingredients.
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Meaning unclear; I'm not sure what you're trying to say?
具材が決まっています。https://www.kamaboko.com/column/43633/