Poaching (cooking)
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Poaching (cooking)
Poaching is a cooking technique that involves heating food submerged in a liquid, such as water, milk, stock or wine. Poaching is differentiated from the other "moist heat" cooking methods, such as simmering and boiling, in that it uses a relatively lower temperature (about ). This temperature range makes it particularly suitable for delicate food, such as eggs, poultry, fish and fruit, which might easily fall apart or dry out using other cooking methods. Poaching is often considered a healthy method of cooking because it does not use fat to cook or flavor the food. Variations Shallow poaching This moist-heat cooking method uses a sautoir or other shallow cooking vessel; heat is transferred by conduction from the pan, to the liquid, to the food. Shallow poaching is best suited for boneless, naturally tender, single-serving-size, sliced or diced pieces of meat, poultry or fish. This preparation involves smearing the inside of the pan with whole butter and adding aromatics into t ...
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Poaching Salmon
Poaching has been defined as the illegal hunting or capturing of wild animals, usually associated with land use rights. Poaching was once performed by impoverished peasants for subsistence purposes and to supplement meager diets. It was set against the hunting privileges of nobility and territorial rulers. Since the 1980s, the term "poaching" has also been used to refer to the illegal harvesting of wild plant species. In agricultural terms, the term 'poaching' is also applied to the loss of soils or grass by the damaging action of feet of livestock, which can affect availability of productive land, water pollution through increased runoff and welfare issues for cattle. Stealing livestock as in cattle raiding classifies as theft, not as poaching. The United Nations' Sustainable Development Goal 15 enshrines the sustainable use of all wildlife. It targets the taking of action on dealing with poaching and trafficking of protected species of flora and fauna to ensure their availab ...
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Bisphenol A
Bisphenol A (BPA) is a chemical compound primarily used in the manufacturing of various plastics. It is a colourless solid which is soluble in most common organic solvents, but has very poor solubility in water. BPA is produced on an industrial scale by the condensation of phenol and acetone, and has a global production scale which is expected to reach 10 million tonnes in 2022. BPA's largest single application is as a co-monomer in the production of polycarbonates, which accounts for 65–70% of all BPA production. The manufacturing of epoxy resins and vinyl ester resins account for 25–30% of BPA use. The remaining 5% is used as a major component of several high-performance plastics, and as a minor additive in PVC, polyurethane, thermal paper, and several other materials. It is not a plasticizer, although it is often wrongly labelled as such. The health effects of BPA have been the subject of prolonged public and scientific debate. BPA is a xenoestrogen, exhibiting hormone ...
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Sous-vide
Sous vide (; French for 'under vacuum'), also known as low-temperature, long-time (LTLT) cooking, is a method of cooking in which food is placed in a plastic pouch or a glass jar and cooked in a water bath for longer than usual cooking times (usually one to seven hours, and up to 72 or more hours in some cases) at a precisely regulated temperature. The temperature is much lower than usually used for cooking, typically around for red meat, for poultry, and higher for vegetables. The intent is to cook the item evenly, ensuring that the inside is properly cooked without overcooking the outside, and to retain moisture. History Sous vide cooking is characterized by low-temperature cooking, a longer period of cooking than conventional cooking, a container (such as a plastic bag) that separates the food from its heating environment, and pressurized enclosure using full or partial vacuum. Low-temperature cooking was first described by Benjamin Thompson, Count Rumford in 1799. He us ...
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Stewing
A stew is a combination of solid food ingredients that have been cooked in liquid and served in the resultant gravy. A stew needs to have raw ingredients added to the gravy. Ingredients in a stew can include any combination of vegetables and may include meat, especially tougher meats suitable for slow-cooking, such as beef, pork, lamb, poultry, sausages, and seafood. While water can be used as the stew-cooking liquid, stock is also common. A small amount of red wine is sometimes added for flavour. Seasoning and flavourings may also be added. Stews are typically cooked at a relatively low temperature (simmered, not boiled), allowing flavours to mingle. Stewing is suitable for the least tender cuts of meat that become tender and juicy with the slow moist heat method. This makes it popular in low-cost cooking. Cuts having a certain amount of marbling and gelatinous connective tissue give moist, juicy stews, while lean meat may easily become dry. Stews are thickened by reduction o ...
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Caramelization
Caramelization is a process of browning of sugar used extensively in cooking for the resulting sweet nutty flavor and brown color. The brown colors are produced by three groups of polymers: caramelans (C24H36O18), caramelens (C36H50O25), and caramelins (C125H188O80). As the process occurs, volatile chemicals such as diacetyl are released, producing the characteristic caramel flavor. Like the Maillard reaction, caramelization is a type of non-enzymatic browning. Unlike the Maillard reaction, caramelization is pyrolytic, as opposed to being a reaction with amino acids. When caramelization involves the disaccharide sucrose, it is broken down into the monosaccharides fructose and glucose. Process Caramelization is a complex, poorly understood process that produces hundreds of chemical products, and includes the following types of reactions: * equilibration of anomeric and ring forms * sucrose inversion to fructose and glucose * condensation reactions * intramolecular bon ...
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Simmering
Simmering is a food preparation technique by which foods are cooked in hot liquids kept just below the boiling point of water (lower than ) and above poaching temperature (higher than ). 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 . Japanese cuisine In Japanese cuisine, simmering is often considered one of the four essential cooking techniques, along with grilling, steaming, and deep frying. American cuisine Food prepared in a crockpot is simmered. Examples include stews, chili, soups, etc. Bulgari ...
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Blanching (cooking)
Blanching is a cooking process in which a food, usually a vegetable or fruit, is scalded in boiling water, removed after a brief, timed interval, and finally plunged into iced water or placed under cold running water (known as shocking or refreshing) to halt the cooking process. Blanching foods helps reduce quality loss over time. People often use blanching as a treatment prior to freezing, drying, or canning—heating vegetables or fruits to inactivate enzymes, modify texture, remove the peel, and wilt tissue. The inactivation of enzymes preserves color, flavor, and nutritional value. The process has three stages: preheating, blanching, and cooling. The most common blanching methods for vegetables/fruits are hot water and steam, while cooling is either done using cold water or cool air. Other benefits of blanching include removing pesticide residues and decreasing microbial load. Drawbacks to the blanching process can include leaching of water-soluble and heat sensitive nutrie ...
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Sous-vide
Sous vide (; French for 'under vacuum'), also known as low-temperature, long-time (LTLT) cooking, is a method of cooking in which food is placed in a plastic pouch or a glass jar and cooked in a water bath for longer than usual cooking times (usually one to seven hours, and up to 72 or more hours in some cases) at a precisely regulated temperature. The temperature is much lower than usually used for cooking, typically around for red meat, for poultry, and higher for vegetables. The intent is to cook the item evenly, ensuring that the inside is properly cooked without overcooking the outside, and to retain moisture. History Sous vide cooking is characterized by low-temperature cooking, a longer period of cooking than conventional cooking, a container (such as a plastic bag) that separates the food from its heating environment, and pressurized enclosure using full or partial vacuum. Low-temperature cooking was first described by Benjamin Thompson, Count Rumford in 1799. He us ...
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Denaturation (biochemistry)
In biochemistry, denaturation is a process in which proteins or nucleic acids lose the quaternary structure, tertiary structure, and secondary structure which is present in their native state, by application of some external stress or compound such as a strong acid or base, a concentrated inorganic salt, an organic solvent (e.g., alcohol or chloroform), agitation and radiation or heat. If proteins in a living cell are denatured, this results in disruption of cell activity and possibly cell death. Protein denaturation is also a consequence of cell death. Denatured proteins can exhibit a wide range of characteristics, from conformational change and loss of solubility to aggregation due to the exposure of hydrophobic groups. The loss of solubility as a result of denaturation is called ''coagulation''. Denatured proteins lose their 3D structure and therefore cannot function. Protein folding is key to whether a globular or membrane protein can do its job correctly; it must be ...
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Poached Egg
A poached egg is an egg that has been cooked, outside the shell, by poaching (or sometimes steaming), as opposed to simmering or boiling. This method of preparation can yield more delicately cooked eggs than cooking at higher temperatures such as with boiling water. Preparation The egg is cracked into a cup or bowl of any size, and then gently slid into a pan of water at approximately 75° C (167 °F) and cooked until the egg white has mostly solidified, but the yolk remains soft. The "perfect" poached egg has a runny yolk, with a hardening crust and no raw white remaining. In countries that mandate universal salmonella vaccination for hens, eating eggs with a runny yolk is deemed safe for consumption. Broken into water at the poaching temperature, the white will cling to the yolk, resulting in cooked egg white and runny yolk. Any given chicken egg contains some egg white that is prone to dispersing into the poaching liquid and cooking into an undesirable foam. To prevent this, ...
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Mirepoix (cuisine)
A mirepoix ( ; ) is a flavor base made from diced vegetables cooked—usually with butter, oil, or other fat—for a long time on low heat without coloring or browning, as further cooking, often with the addition of tomato purée, creates a darkened brown mixture called . It is not sautéed or otherwise hard-cooked, because the intention is to sweeten the ingredients rather than caramelize them. It is a long-standing cooking technique in French cuisine. When the mirepoix is not precooked, the constituent vegetables may be cut to a larger size, depending on the overall cooking time for the dish. Usually the vegetable mixture is onions, carrots, and celery (either common 'pascal' celery or celeriac), with the traditional ratio being 2:1:1—two parts onion, one part carrot, and one part celery. Mirepoix is the flavor base for a wide variety of Western dishes: stocks, soups, stews and sauces. Similar flavor bases include the Italian , the Spanish and Portuguese / (braised onions, ...
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Bouquet Garni
The ''bouquet garni'' ( French for "garnished bouquet"; ) is a bundle of herbs usually tied with string and mainly used to prepare soup, stock, casseroles and various stews. The bouquet is cooked with the other ingredients and removed prior to consumption. Liquid remaining in the bouquet garni can be wrung out into the dish. There is no standard recipe for ''bouquet garni'', but most French recipes include thyme, bay leaf and parsley. It may also include basil, burnet, chervil, rosemary, peppercorns, savory and tarragon. Vegetables such as carrot, celery (leaves or leaf stalks), celeriac, leek, onion and parsley root are sometimes included in the ''bouquet''. In Provence, dried orange peel may be added. Sometimes, the ''bouquet'' is not bound with string, and its ingredients are filled into a small sachet, a piece of celery stalk, a net, or a tea strainer instead. Traditionally, the aromatics are bound within leek leaves, though a cheesecloth, muslin or coffee filter tied ...
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