Today is traditionally also know as "Stir it up" Sunday
Stir up, we beseech thee, O Lord, the wills of thy faithful people;
That they, plenteously bringing forth the fruit of good works, may of thee be plenteously rewarded;
Through Jesus Christ our Lord.
So as you stir three times each (east to west to represent the three wise men) say the prayer and make a wish.
My Christmas Pudding recipe can be found here