I have made this 3 times. It has now accumulated a decoction step.
Malt:
Hops: I've listed Hallertau Hersbrucker as the hops, but anything noble will do. Looking for about 480 AA points for 60 minutes and half of that again for 30 minutes.
Yeast: Any good lager yeast that ferments at 8-13C. I've used Escarpment Labs Isar (bock2) and Copenhagen (bock3) and
Omega Yeast Labs - Pilsner II OYL-108, the first time.
Water: Add 500g acid malt and don't add any brewing salts.
Fermenting: start at room temperature (~16C), then once you see good fermentation happening, place brews in cold cupboard and drop a degree a day until it hits 10C or so.
Eisbock: if the weather cooperates, turn 1/2 the batch into eisbock. Put the brew in a corny keg then leave outside overnight when temp is lower than -10C. Save what isn't frozen the next morning, and discard the ice. Repeat a few times... if you dare!