Broth is a liquid in which bones, meat, fish, grains, or vegetables have been simmered and strained out. Broth is used as a basis for edible liquids such as soup.
In 2153, Hoshi Sato claimed that she disliked her grandmother's soba noodles (typically served cold in a thin broth) as a child. (ENT: "Exile")
In 2370, Gideon Seyetik served senior staff of Deep Space 9 a dinner of his creation made of one liter of clear rumall stock, among other ingredients. He claimed this broth was the most important ingredient. (DS9: "Second Sight")
Later, Anna offered to make Jean-Luc Picard a broth from some boiled coltayin roots and Terellian spices. (TNG: "Liaisons")
Also that year, Gia tried to give her ill father Garvin broth with no success. (TNG: "Thine Own Self")
In 2371, Neelix told Chakotay that if he stewed leola roots for a few hours in a light herbal broth, he wouldn't even notice the mildew. (VOY: "State of Flux")
Also that year, in USS Voyager's Beowulf holonovel, the character Freya told how atuta was brewed into a broth to bring fighting spirit to the Vikings. The Doctor recognized it as a poisonous fungus. (VOY: "Heroes and Demons")