You need to either create a slurry in a cold liquid, which also works with cornstarch, or you've got to do your gravy in a very wide pan and kind of scatter the flour over the top and then very quickly whisk it in.
Alton BrownMy first book is really about heat. That book, for me, was an exploration of heat as ingredient. Why we don't talk about heat as an ingredient, I don't quite understand, because it is the common ingredient to all cooking processes.
Alton Brown