I learned the phrase meant family members get together for the dinner on New Year’s Eve.　In our case, “family members” indicates only my old mother and I.　We, however, had grilled spareribs that must be popular among young people.

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大晦日の夜に家族がそろって食事をする、という意味らしいです。うちは老母と私の二人だけですが。でも、若者っぽいスペアリブをいただきました。