Based on a variety of recipes I found online (including https://www.homebrewersassociation.org/homebrew-recipe/english-pale-ale-esb-by-aha-members-brew-gentlemen-brewing-co/ and http://www.fermentarium.com/homebrewing/brewing-beer/how-to-make-an-esb-extra-specialstrong-bitter/ , among others).
Using some of my home (central Iowa)-grown hops for the Cascade and some of the Fuggles, so the IBUs are a total guess... Substituting Northern Brewer (which I have on hand) for British Challenger hops.
{"RecipeId":51579,"RecipeTypeId":10,"OriginalRecipeId":null,"UnitType":"s","IbuFormula":"t","CreatedBy":100912,"Name":"ESB","Description":"Based on a variety of recipes I found online (including https://www.homebrewersassociation.org/homebrew-recipe/english-pale-ale-esb-by-aha-members-brew-gentlemen-brewing-co/ and http://www.fermentarium.com/homebrewing/brewing-beer/how-to-make-an-esb-extra-specialstrong-bitter/ , among others).\nUsing some of my home (central Iowa)-grown hops for the Cascade and some of the Fuggles, so the IBUs are a total guess... Substituting Northern Brewer (which I have on hand) for British Challenger hops.","ImageUrlRoot":null,"StyleId":"11C","StyleName":"Strong Bitter","BatchSize":5.75,"BoilSize":7,"BoilTime":60,"Efficiency":0.8,"DateCreated":"\/Date(1521407215837)\/","BrewSessionCount":0,"MostRecentBrewSession":null,"Og":1.0596869565217391,"Fg":1.0185029565217392,"Srm":11.056968489667039,"Ibu":43.353717625272139,"BgGu":0.726351621052783,"Abv":5.312736,"Calories":203,"AverageRating":0,"TastingNoteCount":0,"Fermentables":[{"Per":"83","Amt":"10","Ppg":"36","L":"2","Use":"Mash","Id":"269519","IngId":"126","Name":"Pale 2-Row - UK","CustomName":"","Rank":"1"},{"Per":"8","Amt":"1","Ppg":"34","L":"75","Use":"Mash","Id":"269520","IngId":"519","Name":"Crystal 70L - UK","CustomName":"","Rank":"2"},{"Per":"8","Amt":"1","Ppg":"35","L":"10","Use":"Mash","Id":"269521","IngId":"22","Name":"Caramel/Crystal 10 - US","CustomName":"","Rank":"3"}],"Hops":[{"Amt":"1","Type":"Pellet","Use":"Boil","Min":"60","Day":"0","AA":"7","Ibu":"21.2068224128366","Id":"290185","IngId":"23","Name":"Northern Brewer ","CustomName":"","Rank":"1"},{"Amt":"1","Type":"Leaf","Use":"Boil","Min":"60","Day":"0","AA":"5.8","Ibu":"15.9739701291496","Id":"288573","IngId":"3","Name":"Cascade","CustomName":"","Rank":"2"},{"Amt":"1","Type":"Pellet","Use":"Boil","Min":"10","Day":"0","AA":"4.9","Ibu":"5.38229582719754","Id":"288575","IngId":"11","Name":"Fuggles","CustomName":"","Rank":"3"},{"Amt":"0.3","Type":"Leaf","Use":"Boil","Min":"5","Day":"0","AA":"4.8","Ibu":"0.790629256088361","Id":"288576","IngId":"11","Name":"Fuggles","CustomName":"","Rank":"4"}],"Yeasts":[{"Atten":"0.69","Id":"75301","IngId":"234","Name":"Wyeast London ESB Ale 1968","CustomName":"","Rank":"1"}],"Others":[],"MashSteps":[],"Steps":[]}