A pyrogen is a substance that induces fever. These can be either internal (endogenous) or external (exogenous) to the body. The bacterial substance lipopolysaccharide (LPS), present in the cell wall of some bacteria, is an example of an exogenous pyrogen.
Kenya is a major producer of tea and coffee. Within the country, coffee is mostly drunk instant and it is not as popular as tea or Chai. Most Kenyans brew their tea with milk and lots of sugar, serving it scalding hot and very sweet. Lager is also popular in Kenya, with local brands made using cornstarch and sugar, as well as the more traditional ingredients of water, malt and hops.
Greens are added to the stews or cooked as an accompaniment and come from cabbage (or kale), the leaves of pumpkin, cocoyam and cassava plants. The stews have many variations and the ingredients depend on what is available and the region of Kenya. The most common stew is Sukumu Wiki made from greens and tomatoes. Other favourite ingredient combinations include meat and potatoes, coconut milk and cowpeas, and beans and corn.