Imperial Stout Recipe - 1 GAL Imperial Brown Stout

{"RecipeId":49701,"RecipeTypeId":10,"OriginalRecipeId":49700,"UnitType":"m","IbuFormula":"t","CreatedBy":103318,"Name":"1 GAL Imperial Brown Stout","Description":"Mash half water volume, then rinse/sparge with other half - aim for more volume than usual as doing 90min boil (about 3.25L per hour boil off?)\n\nBrewer friend calc = 11.8% or 14% with Alternate calculation.","ImageUrlRoot":null,"StyleId":"20C","StyleName":"Imperial Stout","BatchSize":4.5,"BoilSize":9.3,"BoilTime":105,"Efficiency":0.83,"DateCreated":"\/Date(1517320934840)\/","BrewSessionCount":0,"MostRecentBrewSession":null,"Og":1.1322825835305954,"Fg":1.0423304267297906,"Srm":57.338679871419771,"Ibu":66.862923397161993,"BgGu":0.50545522783577457,"Abv":11.603828227303827,"Calories":490,"AverageRating":0,"TastingNoteCount":0,"Fermentables":[{"Per":"64","Amt":"1.45","Ppg":"38","L":"3","Use":"Mash","Id":"258408","IngId":"15","Name":"Maris Otter Pale - UK","CustomName":"","Rank":"1"},{"Per":"8","Amt":"0.182","Ppg":"46","L":"10","Use":"Late","Id":"258409","IngId":"63","Name":"Brown Sugar - US","CustomName":"","Rank":"2"},{"Per":"9","Amt":"0.196","Ppg":"37","L":"9","Use":"Mash","Id":"258410","IngId":"20","Name":"Munich - UK","CustomName":"","Rank":"3"},{"Per":"9","Amt":"0.196","Ppg":"33","L":"65","Use":"Mash","Id":"258411","IngId":"43","Name":"Brown Malt - UK","CustomName":"","Rank":"4"},{"Per":"7","Amt":"0.165","Ppg":"28","L":"500","Use":"Mash","Id":"258412","IngId":"482","Name":"Black Malt - UK","CustomName":"","Rank":"5"},{"Per":"3","Amt":"0.062","Ppg":"32","L":"27","Use":"Mash","Id":"258413","IngId":"29","Name":"Amber - UK","CustomName":"","Rank":"6"},{"Per":"1","Amt":"0.013","Ppg":"33","L":"163","Use":"Mash","Id":"323961","IngId":"4646","Name":"Crisp Dark Crystal (EBC 380-435)","CustomName":"","Rank":"7"}],"Hops":[{"Amt":"18","Type":"Pellet","Use":"Boil","Min":"90","Day":"0","AA":"12.9","Ibu":"66.862923397162","Id":"347248","IngId":"24","Name":"Nugget ","CustomName":"","Rank":"1"}],"Yeasts":[{"Atten":"0.68","Id":"90410","IngId":"159","Name":"White Labs British Ale WLP005","CustomName":"","Rank":"1"}],"Others":[],"MashSteps":[],"Steps":[]}