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Explaining this just to make sure I get it. When we cook we're bringing up food to a certain temp, then maintaining it at that temp till it's done cooking. If

Explaining this just to make sure I get it. When we cook we're bringing up food to a certain temp, then maintaining it at that temp till it's done cooking. If we could perfectly insulate it, then it could hold that temp as long as we want without being on the fire. So the only energy input is getting it hot -- after that it's cooking on its own. So this is trying to approximate that by insulating the pot. I always sort of assumed that there's a lot of heat 'loss' from food itself heating up -- as in most the cook time is getting the food up to the temp (i.e. when cooking a steak), not waiting for it to cook at the temp. But I suppose that for certain grains and stews and things that thinking is wrong.

falcolas 5y ago
You're not wrong - once the food is at the right temperature, it's done. You can hold food at the "right" temperature for a long time, but if you go above it, it'll over-cook. There's a few ways to heat food up, the most common of which is to heat the vessel to well above the right temperature and wait for the food to come up to the right temperature. The cooker linked takes advantage of this method since it is fine if the vessel comes down in temperature a little bit, so long as it doesn't get below the food's "done" temperature. You still have to be vigilant about the temperature of the food, to ensure it's not overcooked. The less common method is to heat the vessel (often water) up to the right temperature, and let the food come to equilibrium. This is basically sous-vide, and would not work with the linked method, since the temperature of water can't go down. You might be able to fudge things a bit by over-heating the water a bit, but then you risk overcooking the food.
- bagacrap 5y ago
  counterpoint: sous vide
- lippel82 5y ago
  Not all food is done once it reaches the desired temperature. A lot of food, e.g. tough meats, need to stay above a certain temperature for a long time until they're done.
  - grogenaut 5y ago
    And to further that, there's a lot of state change happening at those temps, often why things hold at exact temps for a bit (eg boiling), so they can take plenty of energy to go up a tiny amount. Biscuit for instance has "the rest" at around 165-175. It also sweats a lot and cools itself off unless you wrap it.
    - falcolas 5y ago
      Boiling something is more about pulling water out than it is finishing the food. But it's definitely one of the corner cases - for the reason you mention: the temperature increases are small. But temperature for boiled things is still important - see candy for example. The temperature directly indicates the amount of water left in the mixture. All that said, resting is a distinct step from heating that is often required for a food to end up as you expect it to. IWO, yeah, food isn't always ready to eat after heating.
    - grogenaut 5y ago
      Ugh spell check corrected Brisket to Biscuit. Not quite the same thing.
  - falcolas 5y ago
    Well, kinda? For example: smoking. You cook it for a long time at a low heat, but that's more about heating it up slowly as opposed to bringing it to a temperature and holding it there. And ultimately you (well, you're supposed to) gauge its doneness by its temperature; smokers still follow the "the vessel is hotter than your target heat" rule.
    - jayd16 5y ago
      I would think a slow cooker is a good example of sustained temperature making a big difference.
  - adrianmonk 5y ago
    Or dry beans. Imagine if you just brought those up to temperature and skipped simmering for ~1-2 hours. Or pasta. You don't bring the water to a boil and then immediately drain. Or rice, similar to pasta. Or some tougher leafy greens. Collard greens need to be simmered ~30-60 minutes. Or caramelized onions. You are doing chemical reactions (browning sugar, etc.) that take time.

falcolas 5y ago

You're not wrong - once the food is at the right temperature, it's done. You can hold food at the "right" temperature for a long time, but if you go above it, it'll over-cook. There's a few ways to heat food up, the most common of which is to heat the vessel to well above the right temperature and wait for the food to come up to the right temperature. The cooker linked takes advantage of this method since it is fine if the vessel comes down in temperature a little bit, so long as it doesn't get below the food's "done" temperature. You still have to be vigilant about the temperature of the food, to ensure it's not overcooked. The less common method is to heat the vessel (often water) up to the right temperature, and let the food come to equilibrium. This is basically sous-vide, and would not work with the linked method, since the temperature of water can't go down. You might be able to fudge things a bit by over-heating the water a bit, but then you risk overcooking the food.

bagacrap 5y ago
counterpoint: sous vide
lippel82 5y ago
Not all food is done once it reaches the desired temperature. A lot of food, e.g. tough meats, need to stay above a certain temperature for a long time until they're done.
- grogenaut 5y ago
  And to further that, there's a lot of state change happening at those temps, often why things hold at exact temps for a bit (eg boiling), so they can take plenty of energy to go up a tiny amount. Biscuit for instance has "the rest" at around 165-175. It also sweats a lot and cools itself off unless you wrap it.
  - falcolas 5y ago
    Boiling something is more about pulling water out than it is finishing the food. But it's definitely one of the corner cases - for the reason you mention: the temperature increases are small. But temperature for boiled things is still important - see candy for example. The temperature directly indicates the amount of water left in the mixture. All that said, resting is a distinct step from heating that is often required for a food to end up as you expect it to. IWO, yeah, food isn't always ready to eat after heating.
  - grogenaut 5y ago
    Ugh spell check corrected Brisket to Biscuit. Not quite the same thing.
- falcolas 5y ago
  Well, kinda? For example: smoking. You cook it for a long time at a low heat, but that's more about heating it up slowly as opposed to bringing it to a temperature and holding it there. And ultimately you (well, you're supposed to) gauge its doneness by its temperature; smokers still follow the "the vessel is hotter than your target heat" rule.
  - jayd16 5y ago
    I would think a slow cooker is a good example of sustained temperature making a big difference.
- adrianmonk 5y ago
  Or dry beans. Imagine if you just brought those up to temperature and skipped simmering for ~1-2 hours. Or pasta. You don't bring the water to a boil and then immediately drain. Or rice, similar to pasta. Or some tougher leafy greens. Collard greens need to be simmered ~30-60 minutes. Or caramelized onions. You are doing chemical reactions (browning sugar, etc.) that take time.