Achu Soup (Yellow Soup)

Achu soup, called yellow soup for its colour, is a Cameroonian speciality from the North West region, served with pounded cocoyam. The colour is the result of a chemical reaction rather than a spice. Red palm oil is worked together with limestone water, kanwa, ground limestone dissolved and strained, and the alkali reacts with the oil to turn it from deep red to a bright yellow, at the same time thickening it into a smooth, slightly slippery sauce. Nothing else produces that colour, which is why the soup cannot be made without it. Achu itself is the accompaniment: cocoyam boiled and pounded to a smooth, elastic paste, served in a mound with a well pressed into the centre for the soup. Eating it has its own form. The soup is poured into the well and the achu is taken from the edges with the fingers, dipped, and eaten. It is a dish that takes a long time to prepare and is associated with occasions. Achu spice, a regional blend, and assorted meat including tripe and cow skin complete it. **Uses limestone.** Traditional in culinary quantity; measure rather than estimate.