Probably not the right term. Japan's modern "tradition" for Christmas feast usually consist of two things.
One is Christmas cake (which got discounted generously the next day)
The other is chicken, thanks to Colonel Sanders' boys & girls. Chicken with the meat still sticking to the bones. Other than fish, Japanese usually take off the bones from the meat. They don't have tradition of grilling whole chicken like westerners, helped by the fact that Japanese rarely got oven that could fit the chicken in. Then when there's western culture boom (again), KFC promoted the western style of feasting on Christmas eve.
Not sure about where the fuck your girlfriend tradition came from though
For the Abusers who only do the lowliest and most unsightly abuse, a shit manju is sentReimu only eats whole chicken and luxurious cake!OI! Shitty human! Cute Reimu has come as Mister Present! Now welcome her well!