I’m declaring October “Cinnamonth,” and kicking it off with harvest-fresh apple butter. Smooth, cinnamon-spiked apple butter on soft challah was my equivalent of a jelly doughnut when I was growing up. So this year, besides our usual tart Cortlands for pie, we also picked Macouns and McIntoshes (which get mushy when cooked) to whip into apple butter. I’d never made it before, but applesauce is a cinch, so how difficult could it be? Turns out it’s easy, but shockingly time-consuming. Besides the cinnamon and other spices, complex flavors bloom from that mysterious process called caramelization. While applesauce cooks up in less than a half-hour, apple butter takes a whopping 3½ hours. This is a…