While it may appear obvious at first thought, seeing the difference between a rolling boil and a gentle simmer can be a challenge for many home cooks - and can be a crucial detail for the success of a dish! For the sake of technicality, a rolling boil occurs at 212 degrees fahrenheit, and a simmer occurs somewhere around 190 degrees fahrenheit. As you'll see in the video, a rolling boil appears as big bubble bursting to the surface rapidly, while a simmer looks like tiny, finer bubbles rippling to the surface at a slower, but constant, rate. Why is this important? Both methods cook foods by immersion in water at high temperature, but simmering provides a steady, controlled heat source - this insures an even, healthy cook for delicate foods like fish, poached eggs, and starchy vegetables!
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