Kuhn Rikon Durotherm Swiss-Made Cookware, Casserole with Lid, 9-Inch - 3QT The unique double-walled DUROTHERM system cooks with very little water. Suitable for all kinds of stoves. Leave food covered on the hotplate briefly, then place on the heat-retaining base, to keep food aromatic and fresh. The DUROTHERM is so well insulated that food stays hot for up to two hours. All vitamins and nutrients are retained during cooking. Suitable for all kinds of cooking: conventional cooking, low-water cooking and stewing, steaming, cooking in a water bath, tower cooking, and steam stewing