For the cream of carrot soup, peel onion and dice finely. Heat butter in a pot and sauté onions until golden.
Wash and peel carrots and grate into the pot. Boil water and prepare vegetable stock. Peel and crush garlic cloves and add to onion-carrot mixture.
Season with salt and pepper and deglaze with vegetable stock. Let simmer for another 5 minutes.
Meanwhile, cut toast into cubes. Heat oil in a pan. Toast together with some chopped parsley in oil.
Remove the cream of carrot soup from the heat. Stir in sour cream and garnish with toast cubes.