For a perfect result, let the gratin rest for 10 minutes after cooking.
1. Step: Select “ Potato Gratin” program on the Combi and start preheat. 2. Step: Whisk together the cream, cinnamon, nutmeg, salt and pepper until smooth. 3. Step: In a 2-inch half size hotel pan, arrange an even layer of sweet potatoes and turnips. Drizzle with a ¼ cup of the cream, sprinkle with ½ cup of roasted mushrooms. Repeat process to make 8 to 10 layers. Press down on the layers to totally submerge the sweet potatoes and turnips in the cream mixture. Sprinkle Parmesan evenly on top layer. 4. Step: Bake Gratin in the Combi, at program end remove the Gratin and let it rest for at least 10 minutes before serving.