Simmering is a food preparation technique by which foods are cooked in hot liquids kept just below the boiling point of water (lower than 100 °C or 212 °F) and above poaching temperature (higher than 71–80 °C or 160-180 °F). To create a steady simmer, a liquid is brought to a boil, then its heat source is reduced to a lower, constant temperature.
In food preparation
Simmering ensures gentler treatment than boiling to prevent food from toughening and/or breaking up. Simmering is usually a rapid and efficient method of cooking. Food that has simmered in milk or cream instead of water is sometimes referred to as creamed. The appropriate simmering temperature is a topic of debate among chefs, with some contending that a simmer is as low as 82 °C (180 °F).
Dutch and Flemish cuisine
In traditional Dutch and Flemish cuisine, less tender cuts of beef are simmered for several hours to obtain carbonade flamande. Traditionally a small flame is used, fed by burning oil. On modern stoves, the source of heat is put very low, or a simmering plate is used to diminish the heat. Usually a cast iron pan is used with a thick bottom. The meat is ready if it can be easily torn apart into threads. 
Simmering is one of the most popular styles of cooking in Iran and Afghanistan. In traditional Persian cuisine, almost all types of Persian Khoresh are simmered for several hours. That is also the case with some other Iranian dishes like Abgoosht, Bozbash, etc.
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- Simmer definition from About.com - Culinary arts. Retrieved May 2009.
- The Culinary Institute of America (CIA). (2011). The Professional Chef, 9E (p. 263). Hoboken, NJ: John Wiley & Sons, Inc.
- Hosoi, C. (2012). Cooking Classics: Japan. A Step-by-Step Cookbook (p. 13). Singapore: Marshall Cavendish Cuisine.
- "Simmering meat". Retrieved 1 June 2015.
- Gisslen, W. (2011). Professional Cooking, 7E (p. 71). Hoboken, NJ: John Wiley & Sons, Inc.