I read about this in a sci-fi novel in the 1950s, according to Wikipedia* possibly
https://en.wikipedia.org/wiki/The_Space_Merchants.
To achieve that level, they will have to move from self-organized steak medallions to a mass of muscle tissue in a vat that they just slice fillets off of as it grows.
The cannibalism question is the
reducto ad absurdum.
*
https://en.wikipedia.org/wiki/Cultured_meat#In_fiction