What dual function do ingredients like nori wrapping Onigiri or Umeboshi placed on rice serve in bento preparation?

Answer

They act as natural preservation agents aiding palatability at room temperature

When preparing rice for a bento box that will be consumed later at room temperature, certain ingredients are intentionally added for their preservative qualities. Both nori, which wraps sushi or onigiri, and umeboshi (pickled plum) placed atop rice function as natural preservation agents. This traditional culinary technique ensures that the meal remains palatable and safer to eat several hours after being packed, showcasing an intrinsic understanding of food handling woven into traditional Japanese meal preparation methods.

What dual function do ingredients like nori wrapping Onigiri or Umeboshi placed on rice serve in bento preparation?
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