A method for inhibiting unpleasant taste in a food cooked using a chlorophyll-containing oil and fat composition, characterized in that the method comprises a step in which an edible oil and fat composition containing (A) a chlorophyll including one or more selected from the group consisting of chlorophyll a, pheophytin a, and pyropheophytin a and (C) an edible oil and fat has added thereto and mixed therewith (B) a heated/processed oil and fat including one or more oils selected from the group consisting of (b1) a first heated oil obtained by heat-treating an unrefined raw oil including one or more oils selected from the group consisting of a pressed oil from an oil and fat material and an extracted oil from the oil and fat material, or an oil and fat that has passed through one or more steps selected from the group consisting of a degumming step, a deacidification step, and a decolorization step in a step of refining the unrefined raw oil, (b2) a roasted oil obtained by pressing or extracting the oil and fat material that has been roasted, and (b3) a second heated oil obtained by heat-treating an oil and fat containing the oil and fat material and/or a processed product thereof.