Peel the potatoes and cut into slices. Mix with 2 tablespoons of oil and paprika powder. Season with salt and pepper. Spread on a baking tray lined with baking paper. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 2) for 30-35 minutes.
Peel 1 onion, dice finely. Wash the thyme, dab dry, put some aside for garnishing, chop the rest finely. Wash the tomatoes. Heat 1 tablespoon of oil, fry onion and thyme in it.
Grate the tomatoes on the large grater directly into the pot. Throw away any remaining skin and stem base. Sprinkle with 1 teaspoon of curry and let it simmer for about 5 minutes until the liquid has almost evaporated.
Add ketchup, bring to the boil once, season with salt and pepper. Cut the sausages into pieces. Peel 4 onions and cut into slices. Clean, wash and cut the peppers into pieces. Put sausage, onions and paprika alternately on 8 skewers.
Heat 2 tablespoons of oil in a large frying pan and fry the skewers for 6-8 minutes, turning them several times. Arrange skewers with potato wedges and sauce. Sprinkle 1 teaspoon of curry and garnish with thyme set aside.