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Nattō!

"Nattō (なっとう or 納豆) is a traditional Japanese Food made from soybeans fermented with Bacillus subtilis. It is popular especially as a breakfast food. As a rich source of protein and good bacteria, nattō and the soybean paste miso formed a vital source of nutrition in feudal Japan. Nattō can be an acquired taste because of its powerful smell, strong flavor, and slippery texture"  
  
 - Wikipedia