Disclosed is a method for producing an oil and fat composition enriched with lactones, which comprises steps of: keeping an oil and fat composition, which is derived from butter, containing triglyceride containing 4- or 5-hydroxy fatty acid and between 300 ppm and 1200 ppm of moisture content at the temperature where a solid fat exists in the oil and fat composition, thereby non-enzymatically producing gamma-lactone or delta-lactone from triglyceride containing 4-or 5-hydroxy fatty acid in the oil and fat composition the method further optionally comprises steps of placing the raw material oil and fat composition in the melted state under reduced pressure and/or a step of centrifuging the raw material oil and fat composition in the melted state to remove moisture to obtain the oil and fat composition containing between 300 ppm and 1200 ppm of moisture content or optionally a step of adding moisture to the raw material oil and fat composition to obtain the oil and fat composition containing between 300 ppm and 1200 ppm of moisture content. Also disclosed is a method for producing an oil and fat composition enriched with lactones, which comprises steps of: adding at least one additive selected from the group consisting of monosaccharides, disaccharides, oligosaccharides, dextrins, starches, and silica gel to an oil and fat composition, which is derived from butter, containing triglyceride containing 4- or 5-hydroxy fatty acid, keeping temperature of the oil and fat composition at the temperature between 40 and 60°C, thereby non-enzymatically producing gamma-Iactone or delta-lactone from triglyceride containing 4- or 5-hydroxy fatty acid in the oil and fat composition.
