The present invention relates to a method for preparing a composition comprising essentially a compound based on vanillin and ethyl vanillin. The invention also relates to the resulting composition and the uses thereof in many fields of application, in particular in human and animal food. The method of the invention for preparing a composition comprising essentially a compound based on vanillin and ethylvanillin in a vanillin/ethyl vanillin molar ratio of 2 is characterized in that it comprises: a step consisting in melting a mixture of vanillin and ethyl vanillin, which are used in a molar ratio other than 2, with an excess of vanillin representing from 2% to 20% of the weight of the mixture a step consisting in solidifying same, by cooling to a temperature of less than or equal to 50°C ± 1°C and a step consisting in recovering the resulting composition comprising the new compound.
