Prior to Turkey becoming the mainstay of the Christmas meal in England, Goose was traditionally eaten (before the dissolution of the Monestaries during the reign of King Henry VIII, Geese were given by the local monestary to families in the surrounding villages to be eaten as part of the Christmas meal) but I'm sure that other meats were on the menu aswell.
Mustard seeds are kitniyot so Ashkenazi Jews aren't supposed to eat mustard. Some Sephardi and Mizrachi groups will eat mustard though.
figgy pudding
For a lot of Centuries, it was always traditional for UK families to eat goose or the head of a boar. However in the 16th Century it changed to turkeys after it was introduced to England.
You can eat processed mustard as a condiment, seeds, oil, and even the greens.
Traditionally they eat turkey with sage and onion stuffing, cranberry jelly, roast potatoes, Brussel sprouts followed by Christmas Pudding.
People who like the flavor of mustard as well as the flavor of garlic eat garlic mustard.
With fork and mustard
Eat it with Mustard on it.
We eat the ground seeds of the mustard.
Nothing, they are a seed.
No, it can't.
because in the 16th centery turkey was introdused to England and king Henry the VIII was the first person to have turkey on Christmas. after a while it became fashion to have turkey at Christmas.