Peel and chop the onion. Peel and wash the carrots and cut them into large pieces. Potatoes peel, wash and roughly dice.
Heat the oil in a pot. Brown the onion, potatoes and carrots in it. Add 1 tsp. sugar and caramelise lightly. Season with salt, pepper and sweet paprika. Approx. 1 1⁄4 Pour on l water, bring to the boil and stir in the stock.
Cover and cook for about 25 minutes.
Dice bread. Heat butter in a coated pan. Roast bread cubes and seeds in it. Take them out.
Wash the apple, quarter it, remove the core and dice very finely. Mix with horseradish and crème légère. Season to taste with salt and pepper.
Take the soup off the stove, puree it. Season to taste with salt and pepper. Serve with a dollop of apple-horseradish cream, sprinkle with croutons and seeds. Add the rest of the horseradish cream.