I love this recipe, and many/most of the people I share it with have said this is the best beer I've made. (Below are the 3rd and 4th batches I've made. That's not counting the 2 batches where I've used it as a base for pumpkin ale in past years.)
EdWort (and some others) make reference to "pitching this on a yeast cake from another batch of beer". I confess I don't know if this is a colloquial expression that means "reused the washed yeast from a prior batch," or, "I dumped the new wort into the just-vacated fermenter from a prior batch, literally on top of the yeast left in the bottom of the fermenter."
I brewed up a batch of the O-fest on 8/12 using a new smack pack of WY2565 and a 1L starter. This was the first time I've had to use a blow-off tube for any of my beers. Nice yeasties.
On Sat 8/28, I racked this to secondary, and was going to brew another O-fest to dump in the fermenter (literal interpretation), but I chickened out. Instead, I harvested and washed the yeast, letting it settle overnight. I put the clean stuff in another 1L starter, and brewed the new batch on Sunday. Had to install a blow-off tube on Monday. Heh heh.
The washed yeast thing seems to have worked out OK, but I was wondering if I could have saved some time by fermenting the new wort on the old (unwashed) yeast.
Thanks.