What have been cooked in syrup and glazed to make the sweetmeat Marrons Glaces?

Marrons Glacés are made from whole, peeled chestnuts that are first cooked in syrup and then glazed. The process involves simmering the chestnuts in a sugar syrup multiple times to infuse them with sweetness and achieve a shiny finish. Afterward, they are often coated with additional sugar or syrup to create their characteristic glossy appearance. This traditional French confection is enjoyed as a luxurious treat, especially during the holiday season.