Gwinnett Lager recipe is a holotape in Fallout 4.
Location
It can be found behind the bar counter under the collapsed floor of The Shamrock Taphouse.
Transcript
Welcome to ROBCO Industries (TM) Termlink
Greetings Gwinnett franchisee or Licensed Gwinnett
This holotape contains encoded subroutines for the brewing of Gwinnett Brand:
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Blackened Victory Lager
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Attempting to use these brewing subroutines without licensing agreement is considered theft of corporate secrets and will be prosecuted to the fullest extent of the law. If found please return to your local Gwinnett Brewery for a cash reward.
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Notes
Can be given to Drinkin Buddy for him to turn a Gwinnett Lager into an Ice Cold Gwinnett Lager 12 hours later.