9 CFR § 319.881
Liver meat food products
November 6, 2020
Meat food products characterized and labeled as liver products such as liver loaf, liver cheese, liver spread, liver mush, liver paste, and liver pudding shall contain not less than 30 percent of pork, beef, sheep, or goat livers computed on the fresh weight of the livers.
[36 FR 12004, June 24, 1971]