To provide a masking agent that reduces any taste that is derived from food or drink but is undesirable in product design and can improve the taste into a generally desirable taste that the food or drink originally possess; and further provide a masking agent that has many advantages like: the masking agent does not give unnecessary fragrance or flavor in actual concentration when added to food or drink, so that the masking agent can be used to various foods and drinks with high versatility; the masking agent proves high safety because the masking agent has been eaten for a long time; and the masking agent is made from inexpensive general materials easily available, achieving a high cost performance.SOLUTION: The inventors have discovered that adding rotundone to food or drink makes it possible to mask an undesirable taste of the food or drink and improve their flavor without giving unnecessary...

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