First of, sorry of the question is not for here, but I can't seemk to find more proper place…
My question is, how much lemons are needed to produce 1 kilogram pure essential oil, not the method with olive oil, but pure one, with only lemons?
How much lemons are needed to produce pure 1 kg lemon essential oil
lemonoil
Related Solutions
Yes, if you have access to sous vide equipment you can make them in less than a day. Here is the process I followed and it worked perfectly.
You can cook with olive oil, but there's not many reasons to actually do it (see the comments). What is more important than what oil you use, is that the oil is fresh. Some fresh oils you can heat to 450–475 F/230–250 C, but when it starts getting rancid (and oil does very quickly), you will reach the smoke point at around 350 F/175 C.
Harold McGee explains (Youtube).
Oil heated to its smoke point.
What you should consider is price. Olive oil has a subtle flavour and it will mellow out when you're cooking with it and all oils will eventually taste the same after heating.
Bonus tip: I don't remember if it's in the linked video clip McGee talks about this, but to keep oils fresh longer, he suggest wrapping them in tin foil to reflect the light. (And of course keeping them cool, but not in the fridge.)
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Best Answer
I haven't personally tried making lemon essential oil. But according to Young Living, an MD named Jean Valnet estimated that it takes 3,000 lemons to produce one kilo of Lemon essential oil. Here are some links to the estimations (keep in mind that a kilogram is roughly 2.2 lbs):