Takuan, also known as takuwan or takuan-zuke, is a popular pickled daikon radish, a traditional type of tsukemono (Japanese-style pickles).Come in yellow thick strips, takuan, also known as takuwan or takuan-zuke, is a popular traditional Japanese pickle. Made from daikon radish, these yellow pickles are often served together with other types of tsukemono (Japanese-style pickles) in traditional Japanese cuisine. As it is believed to aid in digestion, the pickled daikon radish is also served in bento or at the end of meals.