I was inspired to make this recipe after seeing a recipe for a similar batch in Joan Nathan's acclaimed Jewish Cooking in America (Knopf). Make this once and you will never buy it from the store again. I use a food processor for this (in two separate steps) but you can hand shred it. Wear carpenters glasses to save some tears and keep your kitchen window open. After the mitzvah making a homemade challah for Shabbat, this another one of those pinnacle Jewish recipes.