Amurca

Amurca is the bitter-tasting, dark-colored, watery sediment that settles out of unfiltered olive oil over time. It is also known as "olive oil lees" in English and Turtub in Jordan. Historically, amurca was used for numerous purposes, including as a building material, pesticide, herbicide, and even as an astringent, which was called by the same name. According to Marcus Cato, firewood treated with "crude" amurca burns smokelessly.