Sour cream

Sour cream is a type of food product created by the controlled fermentation of a milk product with bacteria. This foodstuff is often used as a topping in Earth cuisine, and can be created for consumption by Humans with a food synthesizer.

Basil was added to sour cream for asparagus dishes prepared in the food processor units aboard the 23rd century USS Enterprise (NCC-1701). 

During the wait for Jadzia Dax and Worf to marry in 2374, Julian Bashir broke from kal'Hyah to order a steak with mushrooms and a baked potato with sour cream and chives. 

When Erika Hernandez first encountered a replicator, aboard the USS Titan in 2381, she tested the machine's comprehension by ordering a quesadilla of Jack cheese and black beans, with sides of hot salsa, sour cream and guacamole, and a mojito. She found all the elements to be subtly off, including the paste-like sour cream. 

Sour cream could be used as an ingredient in numerous meals and desserts, including kugel, bregit lung, chocolate cake with raspberry frosting, azna and fried mochana shoots.