<P> A peanut butter and jelly sandwich, or PB&J, includes one or more layers of peanut butter and one or more layers of either jelly or jam on bread . Sometimes the sandwich is eaten open - faced or with one slice of bread folded over (effectively a "half sandwich"). If the peanut butter is not spread on each slice of bread, the sandwich will become soggy if it is left too long to sit . </P> <P> Variations on the sandwich can be created by changing the jelly to honey or fruit slices and instead of peanut butter, someone may use almond butter or another nut butter . When marshmallow fluff is substituted for the jelly, the sandwich becomes a fluffernutter . </P> <P> A 2002 survey showed the average American will have eaten 1,500 of these sandwiches before high school graduation . </P> <P> Peanut butter was originally paired with a diverse set of foods, such as pimento, cheese, celery, watercress, and toasted crackers . In a Good Housekeeping article published in May 1896, a recipe "urged homemakers to use a meat grinder to make peanut butter and spread the result on bread ." The following month, the culinary magazine Table Talk published a "peanut butter sandwich recipe . In the early 1900s, this sandwich was adopted down the class structure as the price of peanut butter dropped . It became popular with children by the 1920s as manufacturers began adding sugar to the peanut butter . Since World War II, both peanut butter and jelly were found on US soldiers' military ration list . </P>

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