For the ketchup, peel and chop the onion. Fry in 1 tbsp. hot oil. Sweat curry, 1 tsp. sugar and tomato paste. Add tomatoes and juice, bring to the boil and simmer for 20-30 minutes.
Peel and wash the potatoes and cut them into thick sticks. Heat the fat in a pot or deep fryer to approx. 140 °C. Fry the potatoes in it for 5 minutes in portions. Lift them out and let them drip off.
For the Cole Slaw, mix yoghurt, salad cream, salt, pepper and a little sugar. Cut parsley into strips. Peel, wash, grate and mix the carrots and celery.
Fry the sausages in 1 tablespoon of hot oil all around for 6-8 minutes. For the chips, heat the fat to approx. 170 °C. Fry the potatoes again in portions for about 5 minutes. Lift out and sprinkle with sea salt.
Keep warm. Puree half the sauce. Season to taste with salt, pepper and curry. Cut the sausages into slices. Serve everything.