Upside-down Mandarin Cake

Preheat the oven to 180 °C.

Slice five mandarins thinly and set aside. Grate the zest and squeeze the juice from the remaining three mandarins.

Pour water into a medium saucepan and bring to a boil. Add the sliced mandarins and cook for 3 minutes. Drain and spread the slices on a paper towel to dry.