Peanut butter celebrated on National Peanut Butter Day.

Origin traces to Aztecs; modern form emerged in 1800s.

Rose Davis, not Carver, linked to early peanut butter.

Marcellus Edson patented "peanut paste" in 1884.

Marcellus Edson patented "peanut paste" in 1884.

Marcellus Edson patented "peanut paste" in 1884.

National Peanut Butter Day honors the beloved culinary creation.