mock turtle soup

English Wikipedia has an article on:

mock turtle soup

Wikipedia

mock turtle soup (uncountable)

1. A cheaper imitation of turtle soup, often made from brains and organ meats such as calf's head or calf's foot.
   • 1898, H.G. Wells, The War of the Worlds, London: William Heinemann, page 266:

     We refreshed ourselves with a tin of mock-turtle soup and wine from the neighbouring pantry.