Jon, my father-in-law, has a French onion soup recipe that is famous throughout our family, and I was lucky enough to get my hands on it. Jon's recipes reflect the instinctive, free-form simplicity of a great home cook-a list of ingredients and a general idea rather than a rigid set of measurements. This is a large part of the mystique of historical recipes, which in addition to amazingly creative spelling, almost never do the math. "Take ye a vasty amount onions, and likewyse a potte full of stronge broth, and seethe it well over greate fyre" is all well and good, but to really guarantee an outcome, you need a formula. I always measure things out when first trying a new recipe or jotting down something for the blog.