Use of lignified stalks or of at least one extract of lignified stalks in a cosmetic composition, a food supplement, a nutritional product, a food or a beverage

A method for enhancing a flavor or an aroma of a beverage, comprising the steps of:

• lignifying stalks for 1 to 5 weeks, during which membranes of certain plant cells of the stalks are transformed, under the action of the lignin, into wood, to obtain lignified stalks;
• and
• adding to a beverage at least one lignified stalk extract obtained from the lignified stalks in which lignified stalks are whole, in pieces, or in powder form, or a composition containing the at least one lignified stalk extract, as a flavoring agent or an aromatizing agent to enhance a flavor or an aroma of said beverage.