What is simmering used for?

Online Answer
Simmering is used to cook proteins (fish, poultry, and meats), often in the form of poaching (cooking in enough liquid to cover the food) and braising (cooking in a small amount of liquid). It's also essential when making broth or stock.
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It also helps in tenderizing meats, which is an added advantage while preparing delectable dishes out of inexpensive, tough meats. Disadvantages of simmering are that it is a time consuming process as compared to boiling, and excessive simmering can destroy the nutrients present in the food..
Always cover your pot if you're trying to keep the heat in. That means that if you're trying to bring something to a simmer or a boil—a pot of water for cooking pasta or blanching vegetables, a batch of soup, or a sauce—put that lid on to save time and energy.
It means you gave to clean all your flatware but it is less cleanup than having to put stock in every small pan you have to cool. According to this NYT article, it is safe to leave overnight with the stove turned off. In the morning, bring to a rolling boil for 10 minutes and then continue to simmer..
Simmering is used to cook proteins (fish, poultry, and meats), often in the form of poaching (cooking in enough liquid to cover the food) and braising (cooking in a small amount of liquid). It's also essential when making broth or stock.
Once you've reached the boiling point, lower the heat to bring the liquid down to a simmer. You'll know it's simmering when you see pockets of tiny, continuous bubbles breaking the surface, along with irregular wisps of steam. The liquid should be at the simmering point before you add the meat back to the skillet..