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Environmental Impact
You should not reuse the plastic bags, so there is environmental waste when cooking sous vide. But if you prepare foods conventionally, on a plate, sheet pan, or cutting board, you use energy to cook and wash utensils with hot water and soap. It is hard to say which produces a bigger carbon footprint. Calculations by Prof. Blonder show it’s a close call. The water in the pot does not have to be wasted. Use it for watering plants once it has completely cooled.
Searing
To see how sous vide works, let's take a tough but tasty cut of meat like flank steak, for example. From the underside of the steer, the flank is a hardworking muscle loaded with connective tissue. It is also a thin tapering muscle, usually 1/2" thick on one end and 1" thick on the other. It also often tapers on the sides. If you grill it over high heat the energy moves inward and by the time you have
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