Wash the potatoes and boil them in salted water. Arrange the sliced potatoes in a buttered tray, sprinkle them with the spices, add the butter and bake them for 15 minutes on high heat. Bake the sausages lightly in a grill pan.
Saute the cut into rings onions in a little oil to soften. In a glass oven dish, put the onions, sausages on top, along with the fat they have released and pour on the wine. Put to bake for about 20 minutes, turning the sausages to cook on both sides.
Then add the potatoes to the sausages and bake another 5 minutes.