Food concentrate
Food concentrates were comestibles that had been reduced to their essential elements to allow for ease of storage. 

In 2266, when Doctor Leonard McCoy asked Charlie Evans what he ate on Thasus, he expressed doubt that the crashed ship's supply of food concentrates could have lasted for fourteen years. Later, Spock echoed his doubt, adding that they would have been depleted in a year. ()

Also that year, James T. Kirk referred to Thomas Leighton's supposed synthetic food discovery as a food concentrate. ()

See also 
 Rations
Foods