Article continues below advertisementThe royal family has an annual holiday tradition where they head to their Sandringham Estate in Norfolk to celebrate Christmas cheer and hibernate during the cold winter months.Former royal chef Darren McGrady is now spilling all the secrets about serving up a feast fit for literal Kings and Queens during the merry time.Article continues below advertisementSource: MEGARoyal chef Darren McGrady spilled all the secrets about serving up a feast.