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I have a cake recipe which calls for 1 1/3 cup of vegetable oil. What are the essential properties of vegetable oil in baking? What changes would be expected if I were to substitute peanut or canola oil for the vegetable oil?

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Peanut and canola are vegetable oils. Vegetable oil is a catch-all term, it's not asking for a product labelled "vegetable oil" although you can buy it in the store. Oils labelled vegetable oil are blends and can be any proportion of things like canola (rapeseed), peanut, corn, sunflower, etc. Just don't use Olive oil, it is a vegetable oil but it won't be good for cakes!

Different vegetable oils will give different properties although most will give you about the same result. Canola is flavorless and relatively light while peanut is a bit richer and, well, peanut-y. The differences in your cake will be subtle, however.

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  • Subtle might be an overstatement - I'm not sure most people would even be able to tell the difference between peanut oil and canola oil in a cake.
    – Cascabel
    Oct 31 '12 at 16:28
  • Why would olive oil be bad for cakes?
    – KatieK
    Oct 31 '12 at 16:29
  • What they hey, infinitesimal is too hard to spell.
    – GdD
    Oct 31 '12 at 16:29
  • @KatieK, because it tastes of olives. Just think, chocolate cake with an olive tinge - yech!
    – GdD
    Oct 31 '12 at 16:31
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    Not all olive oil have strong olive taste. Although olive oils sold in non Mediterranean countries are somehow luxurious, and therefore stronger tasting.
    – J.A.I.L.
    Nov 9 '12 at 11:34
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I use extra virgin olive oil in cakes all the time because that's usually all I have on hand it it works just fine. Never tasted a difference and never had anyone else taste a difference. I expect it'd be the same with peanut or canola, which don't even have a strong fragrance like olive oil.

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    It sure would be nice if people would say why they're downvoting people, especially a new person. If you disagree, say why you disagree, so that others can decide if they're willing to take the change. eg, extra virgin olive oil tends to be more expensive, so maybe you're miserly. Or you don't agree on the doesn't give a different flavor (which might be true in the US, as we tend to have olive oil cut w/ cheaper oils)
    – Joe
    Dec 16 '14 at 18:19
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You probably would not notice much difference substituting peanut or canola oil for "vegetable oil", because of the amount of sugar in a cake. On the other hand if you substitute with extra virgin olive oil you will notice a difference, not so much in the flavour, but in the texture. Unlike the other oils mentioned EVOO contains natural mono- and di-glycerides, which are emulsifiers which will give the cake a fine, dense crumb, and help it to hang onto moisture, so that it remains fresh longer. There is a long tradition of using EVOO instead of butter in cakes in places like Italy and France.

As an aside, in the case of pie crusts, which do not contain sugar, I have noticed a flavour difference between oils (if you have not tried making pie crust with oil, do yourself a favour and give it a try; they are super easy). Avocado oil has a slight fruity flavour, and canola had a slight fishy flavour (maybe because it is high in Omega 6) which I find unpleasant. My favourite is peanut oil which has a rich taste (highest in saturated fat) and seems the closest to butter. Unfortunately I did not include EVOO in my side-by-side testing but I am guessing it would produce a very tender crust similar to ones made with shortening, since they both contain mono- and diglycerides.

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