Peel and chop the onion. Clean and wash the zucchini. Chop 3 zucchini finely
Fry the onion and courgette pieces in 2 tbsp. hot fat. Add 3/4 l water and bring to the boil. Stir in broth and season. Cover and simmer for about 10 minutes. Grate remaining zucchini
Cut the toast into cubes. Peel garlic and cut into slices. Wash the basil. Chop finely except for some, add to the soup and puree everything. Add zucchini rasp and cream and simmer for 1-2 minutes
Fry the bread cubes and garlic in 1 tablespoon of hot fat. Season the soup to taste. Garnish with croutons and rest of basil