How exactly does a thermal cooker work?

The short answer is Double Walls.

Why double walls? Cooking is easier and more efficient as a minimum of time is needed to begin cooking. The double-walled construction takes over the cooking process and food finishes cooking OFF THE STOVE while Durotherm keeps your meal piping hot until your family is ready to eat.

Double-walled construction saves up to 60% of cooking energy and reduces clean-up as the Clip-on Serving Base allows you to take Durotherm directly to your table or buffet. A triumph of form and function, these carefully crafted and richly designed cooking and serving casseroles make a striking addition to any kitchen or dining room decor.

Food cooks in its own juice, preserving vitamins and making food naturally delicious. Thermal insulation makes it possible to start cooking on the stove and finish the cooking at the table!