Preheat the oven to 200 degrees.
Add the sausages, potatoes and onion wedges to a baking tray with a drizzle of oil and salt and pepper.
Cook for 30 minutes (or until potatoes are cooked).
Heat a pan with a drizzle of oil and add the chopped onion until softened.
Add the garlic, curry powder & smoked paprika and cook for 1 minute.
Add the tomato puree, Henderson's relish, tomato ketchup and the boiling water and give everything a good mix until gravy consistency. Set aside.
Add a drizzle of oil to the kale and sprinkle over the sausages. Cook for a further 4 minutes until the kale is crispy.
Serve the bake was the curried tomato sauce drizzled over the top.