The chestnut purée is the technical and flavor center of the dessert. It is made from cooked chestnuts passed through a food mill or ricer with sugar, vanilla, and sometimes rum or cognac, producing a dense, earthy paste that is simultaneously sweet and faintly bitter, with a starchy depth that no other ingredient quite replicates. The meringue base provides structural contrast — brittle and airy where the purée is dense and soft — and the whipped cream between them mediates the two textures while adding a cool richness that keeps the dessert from becoming heavy despite the intensity of the chestnut.

The Mont Blanc has been a fixture of French pâtisserie since at least the early 20th century, associated particularly with the salon de thé culture of Paris — the tearoom tradition of afternoon sweets taken with tea or coffee in an unhurried setting. Angelina on the Rue de Rivoli, open since 1903, is the address most associated with the Mont Blanc in Paris, and their version — a substantial construction served on a doily with a pot of their signature hot chocolate — has become something of a pilgrimage object for visitors to the city. It is not the most refined version available in Paris, but it is the most famous, and fame has its own flavor.

Contemporary pastry chefs have reimagined the Mont Blanc extensively — deconstructed versions, miniaturized versions, versions with Japanese influence that have become particularly popular in Tokyo where the dessert has developed an enthusiastic following of its own. The Japanese Mont Blanc, typically made with Japanese chestnuts and a lighter cream, is now distinct enough from the French original to constitute its own category. The French original, meanwhile, remains exactly what it was — meringue, cream, chestnut, precision — and continues to anchor the autumn dessert menus of serious Parisian pastry shops every year when the chestnuts come in.

• Italian Influence