“And on that subject, we need to make a point about the weights and measures used in the cookery recipes. We have, reluctantly, translated them into metric terms, because Nanny Ogg used throughout the very specialized unit of measure known as the 'some' (as in 'Take some flour and some sugar').
This required some, hah, experiment, because the 'some' is a unit of some, you see, complexity. Some flour is almost certainly more than some salt, but there appears to be no such thing as a half of some, although there was the occasional mention of a 'bit' as in 'a bit of pepper'.
Instinctively, one feels that a bit of flour is more than some pepper, but probably less than a bit of butter, and have that a wodge of bread is probably about a handful, but we have found no reliable way of measuring a gnat's.”