JL;DR SUMMARY Rabbi Avrohom Blumenkrantz's Passover guide, which first appeared in 1977 and grew into a comprehensive 600-page tome by the time of his passing in 2007, is a widely used and detailed resource for observing Pesach. A way out west there was a fella, fella I want to tell you about, fella by the name of Jeff Lebowski. At least, that was the handle his lovin' parents gave him, but he never had much use for it himself. This Lebowski, he called himself the Dude. Now, Dude, that's a name no one would self-apply where I come from. But then, there was a lot about the Dude that didn't make a whole lot of sense to me. And a lot about where he lived, likewise. But then again, maybe that's why I found the place s'durned innarestin'.