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Yes, if you leave a normal cooking onion in water in will sprout spring onions.
how long can cut sweet potatoes stay in water before cooking
Sweating is a term used to describe the gentle partial cooking of onions. The term "sweat" refers to the heat and moisture bringing out the bitterness of the onions. You would usually accomplish this by chopping or dicing the onions, putting them in a pot with a little butter/wine/or water, and heating them (covered) over medium-low heat until they become translucent and floppy. Congratulations! You just made onions sweat!
does soaking vegetables in water before cooking cause leaching of water soluble vitamins and minerals
It isn't recommended to cut the potatoes a few days before cooking. As soon as they are cut, the air will hit it and turn the insides brown (like an apple). You can cut them the night before and soak the potatoes in water until ready to cook.
Onions typically contain about 89% water by weight.
You can spray it with cooking spray or water. But you'll more than likely to spray it with cooking spray ''', so it couldn't stick to the pan.'''
Measuring the water during cooking would be in two steps. One would be to measure the correct amount of water before cooking, and the second would be to monitor the activity of the water during cooking. Monitoring the activity means to see if the water is simmering, poach-friendly, boiling, steaming, etc.
No you don't.
Soak it in water to keep it from browning
Yes, just cover with water and refrigerate. Right before cooking, drain and pat dry with paper towels.
The flavonol quercetin that is found in red onions is not broken down or lost during cooking; it just gets transferred to the liquid part of the dish. However, to ensure maximum benefits from the flavanol, opt for lower-heat cooking methods. According to one study, when baking or sauteing, the quercetin (http://www.guidechem.com/cas-117/117-39-5.html) level of onions actually increases by up to 25% (this might be due just to the loss of water). However, when boiling onions, the concentration of quercetin goes down by 18%.