Tonka (fuel) necessary for the mixture to work as desired, rather than fail catastrophically, is a function both of the ingredients' purity, and of their temperature during use. Tonka (fuel) Tonka (also TONKA-250 and R-Stoff) is the name given to a German-designed rocket propellant first used in the Wasserfall missile; it has also more recently been used by North Korea but found its greatest applications (under the name TG-02) in the Soviet Union, for example, in the propulsion projects of the A.M. Isayev Chemical Engineering Design Bureau. Its name is a reference to the tonka bean; as it was invented during the
Sichuan cuisine unusual custom in other parts of the country. The salt produced from Sichuan salt springs and wells, unlike sea salt, does not contain Iodine, which lead to goiter problems before the 20th century. Sichuan cuisine often contains food preserved through pickling, salting and drying. Preserved dishes are generally served as spicy dishes with heavy application of chili oil. The most unique and important spice in Sichuan cuisine is the Sichuan pepper (). Sichuan peppercorn has an intense fragrant, citrus-like flavour and produces a "tingly-numbing" () sensation in the mouth. Other commonly used spices in Sichuan cuisine are garlic, chili peppers,