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Do I have to roast peanuts before grinding them or after grinding them?
Does it matter?

May I roast the peanuts with their papery skin on?

What should I expect from the output if I make the peanut butter with the peanuts with their papery skins on?

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If you're going to roast the peanuts, definitely roast them before grinding. Do like you would any other nuts: in the oven, maybe 350F, spread out not too deep in a pan, until they smell toasty and nutty, making sure not to burn them.

If you ground them into peanut peanut butter, and then tried to roast it, it'd be a lot tougher to roast. You'd have to spread it out in a thin layer on a pan, since if it's thick only the surface would really roast. You'd have to be really careful about overroasting, since you won't be able to directly see if the bottom is scorching. And then you'll have to scrape out the pan to try not to waste any, and still have a greasy pan to clean up. Roasting before, on the other hand, is easy. There's space for air between the peanuts so they'll all roast. You can easily give them a stir if you need to, and see directly whether they're burning. And the pan will basically still be clean when you're done.

Whether or not to remove the skins is mostly down to personal preference. You will end up with flecks of skin in the peanut butter, so if that bothers you, remove them. If you're really sensitive (and eating the peanut butter mostly by itself) it's possibly you'd notice a texture difference too. But they won't taste bad (some people even think they improve the flavor), so do whatever you feel like!

If you do want to remove the skins, you can and should wait til after roasting: they should be much looser and easier to remove after roasting. You might even be able to get a lot off simply by putting them in a bowl or colander and shaking. Otherwise, putting them in a kitchen towel and rubbing around should work pretty well.

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No - you don't have to roast them but you probably want to. 10-15 minutes at 350 - until shiny - should do.

I wouldn't leave the paper on - it won't blend well.

Output with paper on? There will be unblended paper chips in your peanut butter. Even if you can't see them... they're in there.

Use a food processor while the nuts are still warm. Pulse a few times and then remove 1/3 of the crumbles if you want chunky peanut butter. Run the processor for about a minute, now it will be hard and crumbly - no worries, just continue processing for another minute or two. Add you oil/sweeteners/flavors and continue processing until smooth. (Note, you won't ever reach store bought smoothness.)

  • You didn't answer whether I should roast them before or after grinding. – Aquarius_Girl Dec 27 '14 at 3:09
  • First line I said that you don't have to but if you do, roast at 350 for 10-15 minutes. Hope it helps. – Gringo Dave Dec 27 '14 at 11:38
  • No it is not helping. I am not asking for the duration. I am asking about the timing ... before grinding or after grinding. – Aquarius_Girl Dec 27 '14 at 13:10
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    Why would you do so? What will happen if I do the reverse? – Aquarius_Girl Dec 27 '14 at 17:14
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    It would be weird to grind them, roast them, and then grind them again. It just seems like an unnecessary step. Edit: though I guess you might be able to get a more intense roast that way. – Preston Dec 28 '14 at 15:52

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