Peanuts are native to the tropics of the Americas and were mashed to become a pasty substance by the Aztec Native Americans hundreds of years ago. A number of peanut paste products have been used over the centuries, and the distinction between peanut paste and peanut butter is not always clear in ordinary use. Early forms of peanut butter, like the Aztecs’ version, were nothing but pure roasted peanut paste. Modern processing machines allow for very smooth products to be made, which often include vegetable oils to aid in its spreadability.

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