Doppelbock (literally "double bock") is a stronger and usually darker version of the Bavarian Bockbier. It is exceptionally malty, with very little bitterness. Standard Doppelbocks may have as much as 7% alcohol by volume.
After it is cooked, it is again returned to the mash tub where it warms the remainder of the mash. This is repeated three times in the Triple-Mash-Process.