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A slow cooker is a Countertop electrical Home Appliance that is used to cook Stew s and other dishes containing water at relatively low Temperature s, with correspondingly long cooking times (several hours). Many recipes simply call for the ingredients to be put in the cooker with little preparation. The slow cooker can then safely be left to run unattended, making it a convenient cooking method. The modern slow cooker was developed by Rival Industries with the Trademark ed name Crock Pot. This name is sometimes used informally to refer to any slow cooker. Rival purchased and refined the design of a bean-pot called the ''Beanery'' from Naxon Co. of Chicago.http://www.slate.com/id/2113226 DESIGN A slow cooker consists of a lidded round or oval Cooking Pot (typically 10 in (25 cm) across and similarly deep) made of Glazed Ceramic or Porcelain , surrounded by a housing, usually metal, containing a Thermostat ically controlled Electric heating element. The lid is often made of Glass so that users can see the contents without having to remove it, and is not Hermetic . The ceramic pot, often referred to as a crock, acts as both a cooking container and a Heat Reservoir . Slow cookers come in a variety of sizes, with capacities starting as small as 16 oz. and going up to several quarts. Many slow cookers have two or more temperature settings (e.g., low, medium, and high). A typical slow cooker operates at 80°C (176°F) on low, 90°C (194°F) on high, and 1 hour at 90°C followed by 80°C on medium. Often slow cookers sold in the US in the past several decades will not slow cook at all: all of the settings bring the contents to a full boil, with the only difference in setting being the amount of time to come to a boil. This may be due to concerns about product liability from unsafe food holding temperatures. OPERATION Raw food and a liquid which is predominantly water (water, wine, stock, but not oil without water) are placed in the slow cooker. The lid is put on and the cooker is switched on. The heating element heats the contents to a steady temperature in the 175–200°F (80–95°C) range. The temperature can never exceed the boiling point of water at Atmospheric Pressure , as the non-hermetic lid does not allow pressure to build up. The contents are enclosed by the crock and the lid, and attain an essentially constant temperature. Little vapor is produced due to the low temperature, and condensed vapor tends to form around the lid, keeping evaporation very low. Vapor may condense on the lid and fall back on the contents, keeping them moist if above the liquid level. The liquid has the important function of transferring heat from the pot walls to the contents, and it also distributes flavours. A lid must be used to prevent warm vapor from escaping, cooling the contents. The lid should not be removed to stir the food or for any other reason, as this would significantly prolong required cooking time due to heat loss. By contrast, a Pressure Cooker cooks quickly at temperatures well above 212°F (100°C) using Steam at high Pressure and Temperature , as it is hermetically sealed. Unlike a pressure cooker, a slow cooker cannot explode even without a safety valve as the contents are at atmospheric pressure. Ovens Broil at 600°F (320°C), and Bake at 300 - 500°F (150 - 260°C). Water-based foods in saucepans are often cooked at the boiling point of water. A lower temperature can be used, but is difficult to maintain accurately. Modern US slow cookers have a low setting of about 200°F and a high setting of about 300°F. RECIPES Recipes intended for other cooking methods must be modified for slow cookers. Often water must be decreased, as cooking at higher temperatures requires enough liquid to allow for evaporation. Some slow cookers are supplied with recipe booklets; many slow cooker recipes are to be found in cookbooks and on the internet. A small number of cookbooks seek to make complete dishes in a slow cooker using fewer than five ingredients, while others treat the slow cooker as a serious piece of culinary equipment capable of producing gourmet meals. With some experience, timing and recipe adjustments can be successfully made for many recipes not originally intended for these cookers. The long, moist nature of the cooking method gives good results even with cheaper (and tougher) cuts of meat—in fact, cheaper cuts often have more flavour. ADVANTAGES In a slow cooker, the temperature is low enough to avoid badly overcooking food even if cooked for far longer than necessary. However, meat may become nearly tasteless if overcooked. Some foods are better cooked at temperatures below boiling. In particular, the tough connective tissues of meat are broken down without affecting the texture of the meat. DISADVANTAGES Vitamin s and other trace nutrients are lost, particularly from vegetables, partially by Enzyme action during cooking. When vegetables are cooked at higher temperatures these enzymes are rapidly Denatured and have less time in which to act during cooking. Blanched vegetables, having been exposed to very hot water, have already had these enzyme rendered largely ineffective. Since slow cookers work at temperatures well below boiling point and do not rapidly denature enzymes, vegetables tend to lose trace nutrients. Green colors are retained better when vegetables are cooked quickly as plant cells are less likely to lose acids. Not all Toxin s that may be present in food are destroyed by cooking at slow cooker temperatures. Some Legume s are toxic when cooked at slow cooker temperatures, especially Kidney Beans , and can cause food poisoning. Phytohaemagglutinin , US FDA's ''Bad Bug Book'' or ''Foodborne Pathogenic Microorganisms and Natural Toxins Handbook''. Kidney beans may be five times more toxic if cooked at 80 °C than if eaten raw. Slow cookers do not typically provide sufficient heat to compensate for frequent additions and removals of food in Perpetual Stew s ( Pot Au Feu , Olla Podrida ); nor do they cook quickly enough to cook newly added food thoroughly before the next withdrawal becomes likely. This relatively slow recovery of temperature after an addition or withdrawal may cause safety problems. Removal of the lid lets heat and moisture escape, prolonging cooking time and giving microbes the chance to grow. Some slow cookers may contain a Lead glaze.http://hgic.clemson.edu/factsheets/HGIC3864.htm Lead is a dangerous toxin that is stored in the body. SEE ALSO REFERENCES EXTERNAL LINKS |
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