Yup, your yeast cake is whats left over in your primary after you transfer your batch to the secondary. You can either rack another batch of beer over it, or you can collect it, and wash it to save it.
Up Next: Cherry Chocolate Rye
Up Next: Gold Nugget IPA
On Tap:Pawtucket Patriot
Dead Soldier:Hop Rod Rye Stout
Dead Soldier: Imperial Hell Fire Ale