You can cook food in warm liquid. 

You can cook food in warm liquid. 

Poaching is a gentle way to cook food. You cook food by putting it in a warm liquid. 
Poaching is good for delicate foods. These are foods that might fall apart easily. Fish, eggs, poultry, and fruit are good choices. The heat stays low. This helps the food stay juicy. It does not pull moisture out of the food. 
There are two main ways to poach. Shallow poaching uses a small amount of liquid. The food is only partly covered. Deep poaching uses a lot of liquid. The food stays fully under the liquid.
People often add flavor to the liquid. They might add herbs or spices. This liquid is called a cuisson. You can use it later to make a sauce. When you poach eggs, you can use a whirlpool. This helps the egg stay together. The egg white stays soft while the yolk gets firm.
Poaching is a gentle way to cook food in liquid. You can use water, milk, stock, or wine. 

This technique works best for delicate foods. These are foods that might fall apart easily. Examples include eggs, poultry, fish, and fruit. Poaching helps the proteins change without losing too much moisture. You must keep the heat low. You should also keep the cooking time very short. This helps keep the flavor inside the food. When poaching an egg, you might make a whirlpool in the water. This helps the white wrap around the yolk. The white stays soft while the yolk begins to harden.
There are two main ways to do this. Shallow poaching uses a pan called a sautoir. You smear the pan with butter and add aromatics. The food sits on top of these items. You pour in cold liquid until it is partly submerged. The liquid should stay near boiling but never actually boil. Deep poaching is different because the food is fully submerged. You use a pot that holds the food and liquid comfortably. You can use a tight lid to help the liquid get warm.
Flavor is very important in poaching. The liquid is often a stock or a court-bouillon. A court-bouillon is a liquid made with acid and aromatics. You might use wine or lemon juice. You can also add herbs like a bouquet garni. People sometimes use a mirepoix of vegetables. The liquid used for shallow poaching is called a cuisson. 
Poaching is not the same as stewing. Stewing uses simmering to soften food. Poaching aims to keep the shape and structure of the food. It is also different from blanching. Blanching is used to raise the temperature of food very quickly. Some people use a method called sous-vide to regulate food at low temperatures. Poaching can be done at home using plastic bags. This is a newer way to do shallow poaching. It makes the task very convenient for cooks. 
Poaching is a specialized moist-heat cooking technique. It involves heating food while it is submerged in a liquid. This liquid can be water, milk, stock, or wine. 
The mechanism of poaching relies on controlled, low temperatures. The liquid should ideally stay between 160 and 180 degrees Fahrenheit. This temperature range allows proteins to denature without losing much moisture. If the heat is too high, the food may dry out. If the cooking time is too long, the texture suffers. Therefore, cooks must keep the heat low and the time to a minimum. This balance helps the food retain its natural flavor and shape.
There are two main types of poaching: shallow and deep. Shallow poaching uses a sautoir, which is a shallow cooking vessel. The cook smears the pan with butter and adds aromatics. The food is placed on top of these aromatics with the presentation side up. Cold liquid is then poured in until the food is only partially submerged. 
Flavor is a central part of the poaching process. Chefs often use a court-bouillon as the poaching liquid. A court-bouillon is a flavorful liquid made of an acid and aromatics. The acid might be wine or lemon juice. The aromatics can include herbs and spices like a bouquet garni or a mirepoix. In shallow poaching, the liquid is called a cuisson. This liquid is often reduced to create a base for a sauce. 
Different foods require different liquids to enhance their taste. For example, eggs are generally cooked in water, sometimes with vinegar. Fish is often poached in white wine. Poultry is typically cooked in stock. Fruit may be poached in red wine. This transfer of flavor is a two-way street. A significant amount of flavor moves from the food into the liquid. This is why the remaining stock or cuisson is so valuable for making soups or sauces.
Poaching is often confused with other moist-heat methods like simmering, boiling, or stewing. Simmering uses a higher temperature than poaching to cook food evenly. Boiling uses the highest possible temperature for water. Unlike boiling, poaching is gentle enough for delicate foods. Poaching is also different from stewing. While both use simmering, stewing aims to soften food. Poaching aims to retain the basic shape and structure of the ingredient. 
Modern variations have introduced even more ways to use these principles. One contemporary technique for shallow poaching involves using BPA-free plastic bags. This method is very convenient for home cooks. Another method, called sous-vide, uses low temperatures to regulate food for extended periods. Whether using traditional pots or modern bags, poaching remains a way to achieve delicate nuance. It allows for the enjoyment of "blanc" foods, which many people find very pleasant.
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