While perhaps less civilized, letting the toddlers eat from the jar directly is much more convenient.
My 1st son ate pb sandwiches starting at about 3 and one day he stuffed one into the VHS player just like it was a movie. I guess he thought that if it tasted good, it might be worth watching on TV. So after that came the spoon method.
My 2nd son loves it, and all the little Russian toddlers that come around love it too. Their mothers, on the other hand, approach it like it might be explosive or radio-active. Massively suspicious.
They dip the tippy end of their pinky finger into the jar and taste hardly enough to even see.
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Then they approve their child to have a small spoonful.
Peanut butter is the most distinctly American food there is.