Walnut skin has a bitter taste. According to the inquiry about the health care of colored cattle, the skin of walnut kernel is rich in a variety of phenolic and flavonoid phytochemicals, and it tastes bitter. When making walnut peanut butter, the whole walnut will be put in, so walnut peanut butter tastes a little bitter. In the parties of 20 18 and 3 15, CCTV revealed that there were no walnuts in the fake version of walnut peanut drink.