
The name comes from a bit of the church service for the day - Stir up, we beseech thee, O Lord, the wills of thy faithful people...
These days I really do have to stir myself to have a big baking session, but this link from the BBC food website shows that there's lots of inspiration for bakers, even if you don't fancy hours of pudding steaming.
www.bbcgoodfood.com/howto/guide/stir-sunday