From Wikipedia:
White pudding or oatmeal pudding is a meat dish popular in
Scotland, Ireland, and Newfoundland. It is also quite popular in Devon and Cornwall, where it is known as hog's pudding. It is very similar to black pudding, but does not include blood. Consequentially, it consists of pork meat and fat, suet, bread, and oatmeal formed into the shape of a large sausage. Earlier versions (pre-1990) often had brain matter (sheep) added as a binding agent.
In
Scotland, white pudding can also be known as mealy pudding. It consists of suet, oatmeal, onions and spices. Some versions of Scottish white pudding are suitable for vegans, in that they contain no animal fat, vegetable fat being used instead.