A flavor modifying composition useful in imparting the taste and odor of the black truffle (tuber melanosporum) to a foodstuff comprising a mixture consisting of dimethylsuslfide and about 0.3 to 3 times the weight of dimethylsulfide of methyl-2-butanal, one or more adjuvants selected from the group consisting of acetaldehyde at 0.4 to 4 times the weight of dimethylsulfide, methyl-2-propanal at 0.5 to 5 times the weight of dimethylsulfide, butanone-2 at 0.3 to 3 times the weight of dimethylsulfide, methyl-2-propanol at 1 to 5 times the weight of dimethylsulfide, and methyl-b 2-butanol at 1 to 5 times the weight of dimethylsulfide, and one or more secondary adjuvants selected from the group consisting of propanal at 0.01 to 0.5 times the weight of dimethylsulfide, anisol at 0.01 to 0.5 times the weight of dimethylsulfide, acetone at 0.5 to 2 times the weight of dimethylsulfide, propanol-1 at 0.1 to 1 times the weight of dimethylsulfide, butanol-2 at 0.01 to 0.1 times the weight of dimethylsulfide and ethanol 1 to 10 times the weight of dimethylsulfide, said mixture being diluted in a food grade solvent at a weight ratio of dilution between about 50 and 10,000.