Peel the potatoes, wash them, cut them into sticks and grate them dry in a tea towel. Heat the frying fat and pre-fry the French fries in portions at 150 °C for approx. 3 minutes. For the sauce, peel onion and banana and cut into fine cubes.
Heat 1 tablespoon of oil and briefly sauté the onion until transparent. After about 2 minutes add banana. Sprinkle with 1-2 tbsp curry. Stir in tomato paste and ketchup. Bring to the boil while stirring and simmer briefly. Season to taste with salt and sugar.
Heat 1 tablespoon of oil and fry the sausages for 6-8 minutes while turning. Fry the French fries in portions at 180 °C. Mix 1 tablespoon salt and 1 tablespoon grill barbecue spices and season the chips. Cut the sausages into slices.
Serve the sausages with sauce and chips. Dust with curry.