This homebrew-scaled recipe from Abnormal Beer Co's (San Diego, California) is the imperial stout base commonly used before it gets treatments such as vanilla, coffee, coconut, and more.
ALL-GRAIN
Batch size: 5 gallons (19 liters)
Brewhouse efficiency: 59%
OG: 1.110
FG: 1.032
IBUs: 40
ABV: 10.3%