Oh, that's the thing of it . . . different tubes can vary a bit in flavor and in volume and I don't really know why. In general, I'd say taste it first and then decide to go over 1/3 of a tube, or under. That's funny you mention cornbread. My dad was just looking for "The Perfect Cornbread Recipe", which I am totally down with. I don't know why, but physical limitations don't seem to apply to my stomach when it comes to cornbread. It just keeps going in . . . Pretty sharp of your grandfather though. I'm only limited in baking knowledge, but I'm told that as long as the proportions stay the same, recipes generally turn out ok, if you wanted to scale down or scale up. I've heard more than one person say that bakers who become cooks are generally better cooks. I only know one baker who also cooks, but he is a pretty dope cook, so I'll buy it. That's a good line to walk.He's a consummate professional when professionalism is appropriate, and a cut-up when it isn't necessary.