There was topping leftover from Saturday's Zwiebelkuchen that needed to be eaten. This is what I came up with:
Peel and thickly slice some potatoes. Steam the slices until almost cooked through then transfer them in a single/double layer to an olive-oiled baking dish, sprinkle with salt. Combine the zwiebelkuchen topping with additional beaten egg and spread over the potatoes. Bake at 180C until the topping is done.
Nice, nice stuff.