▁cer emon ies ▁where by ▁those ▁in ▁attend ance ▁who ▁are ▁observed ▁to ▁viol ate ▁formal ▁et iqu ette ▁are ▁" p un ished " ▁by ▁being ▁sent ▁to ▁" the ▁gro g " ▁and ▁public ly ▁drink ▁from ▁it ▁in ▁front ▁of ▁the ▁at ten de es . ▁The ▁gro g ▁usually ▁consists ▁of ▁various ▁alco hol ic ▁be ver ages ▁mixed ▁together , ▁un appe aling ▁to ▁the ▁taste , ▁and ▁contained ▁in ▁a ▁to ile t ▁bow l . ▁A ▁non - al co hol ic ▁variety ▁of ▁the ▁gro g ▁is ▁also ▁typically ▁available ▁for ▁those ▁in ▁attend ance ▁who ▁do ▁not ▁consume ▁alco hol , ▁and ▁can ▁contain ▁anything ▁from ▁hot ▁sau ce ▁to ▁may onna ise ▁intended ▁to ▁make ▁it ▁un appe aling ▁as ▁well . ▁ ▁Similar ▁practice ▁continued ▁in ▁the ▁Royal ▁Navy ▁until ▁" Black ▁Tot ▁Day ", ▁on ▁ 3 1 ▁July ▁ 1 9 7 0 , ▁when ▁concerns ▁over ▁crew ▁members ▁operating ▁mach in ery ▁under ▁the ▁influence ▁led ▁to ▁the ▁rum ▁r ation ▁being ▁abol ished . ▁ ▁Vari ous ▁reci pes ▁While ▁many ▁claim ▁to ▁make ▁a ▁traditional ▁n avy ▁gro g ▁reci pe , ▁there ▁are ▁several ▁accepted ▁forms . ▁The ▁Royal ▁Navy ' s ▁gro g ▁reci pe ▁includes ▁le mon ▁ju ice , ▁water , ▁rum , ▁and ▁c inn am on . ▁ ▁A ▁commonly ▁found ▁reci pe ▁in ▁the ▁Car ib bean ▁includes ▁water , ▁light ▁rum , ▁gra pe f ruit ▁ju ice ,