Answer:

meat

AnswerCrossword Clue
MEATButcher's stock
MEATHeadcheese, essentially
MEATEdible flesh
MEATSum and substance
MEATCarnivore's need
MEATGoes with potatoes
MEATPotatoes' companion
MEATFood in a locker
MEATRibs and such
MEATHam or lamb
MEATAnother man's poison
MEATGist
MEATItem vegans eschew
MEATHeart of the matter
MEATVegan's no-no
MEATVegan's taboo
MEATPith
MEATNutshell's contents
MEATVegan no-no
MEATEdible part of a nut
MEATPescatarian no-no
MEATFlexitarian's occasional fare
MEATGorillas don't eat it
MEATNitty-gritty
MEATEssence
MEATSubstantial content
MEATCrux
MEATDeli offering
MEATSteaks and chops
MEATHam or hamburger
MEATPotatoes partner
MEATSubstance
MEATBeef, e.g.
MEATCold cuts
MEATBarbecue fare
MEATHam, e.g.
MEATPotatoes' partner
MEATCarnivore's diet
MEATDeli array
MEATCharcuterie fare