I’ve discovered that the 1/3 symbol is not appearing correctly in at least some Kindle apps (those for i-devices and the Kindle app). I am editing the book to replace the symbol with plain numbers & a slash. The changes will likely go live sometime on Monday or Tuesday. I will post here and make a tweet when they do.
If you are using the cookbook on an iPad, computer, or other non-eInk Kindle device, if you see a plain square where there should be a unit of measure, each of those should be “1/3”, with the exception of the recipe for Basic Sweet Scones, in which the measure should be “2/3 cup milk or half & half.”