Peel the vegetables and chop into small pieces. Put the vegetables in a saucepan and add water so that they are covered. Cook for 30-40 minutes on low heat, season with salt and pepper and puree with a hand blender. Toast the bread slices in a pan with a touch of oil and thyme. Serve the soup on plates with Tête de Moine AOP rosettes and serve hot with bread slices.