“In the late-19th century, at elegant ladies’ luncheons, a popular snack was small, crustless tea sandwiches with butter and cucumber, cold cuts or cheese. Around this time, health food advocates like John Harvey Kellogg started promoting peanut products as a replacement for animal-based foods (butter included). So for a vegetarian option at these luncheons, peanut butter simply replaced regular butter.” From The Conversation: In America’s sandwiches, the story of a nation.