They're cooked with a lot of oil too - all adds to the syns.
The flour has sins because it doesn't provide much nutritional value, and doesn't have a high water content, which is what fills us up.
You could have a bash at trying to make them sin-free, but remember that if you change the way food is used it becomes sins (eg, grinding cous cous up to create a flour substitute would need to be sinned).
Hmmn, yorkshires..........