Fungus Deal

 refers to an unmarked and repeatable quest in Fallout 3.

Talking with Eclair, Little Lamplight's cook, will reveal that he is in need of Strange Meat, which he can cook into something semi-edible the children of little lamplight throw into the pools of little lamplight, this makes the fungus "grow crazy fast", if you talk to Eclair he will actually tell you that the first children threw bodies into the pools by which they fed the fungus, that seems to be flesh-eating, with human flesh as its preferred food. Lucy, Little Lamplight's medic needs Buffout, from which she can derive a useful treatment for the rickets Little Lamplighters are subject to due to malnutrition and lack of exposure to the sun. Although the player must get Mayor MacCready to agree to it, Eclair and Lucy will both trade one unit of Cave Fungus for two of Strange Meat or Buffout respectively. The fungus removes a small amount of radiation in addition to healing the player.