Wash potatoes thoroughly, dab dry and cut into slices. Wash thyme and chop coarsely. Mix everything with about 1/2 teaspoon salt, about 1/2 teaspoon pepper and oil. Distribute on a baking tray. Then bake in a preheated oven (electric cooker: 200 °C/recirculating air: 175 °C/gas: level 3 for about 45 minutes.
In the meantime cut the curry sausages into pieces. Turn the potatoes after about 25 minutes and push them onto one half of a tray. Distribute the sausage pieces on the empty half of the baking tray. Shortly before the end of the frying time, sprinkle with ketchup and season with approx. 1 tsp. curry.
Arrange potatoes and curry sausage and garnish with thyme. Season the sausage with curry again if necessary.