Primordial soup

Primordial soup was a liquid substance composed largely of sugars and amino acids. The Seventh Doctor referred to it as "the most precious substance in the universe, from which all life springs." (TV: Ghost Light)

Circa 400 million BC, the Fourth Doctor, Romana and Duggan discovered a pool of primordial soup (which the Doctor referred to as "amniotic fluid") in the middle of would one day be the Atlantic Ocean. Nearby, Scaroth tried to take off in his ship, but it exploded, releasing radiation which reacted with the soup. As the Doctor had earlier explained, the amino acids would fuse to form cells which would eventually evolve into plants and animals. (TV: City of Death)

In 1883, Light turned Inspector Mackenzie into primordial soup and served it to Josiah Samuel Smith and his company, though none of them ate it. (TV: Ghost Light)