For the raspberry-peach soup, dip the peaches briefly in boiling water, skin, halve and pit them. Cut the flesh into small cubes.
Puree the raspberries and pass through a fine sieve. Pour salt, raspberry puree, sugar and juice of one lemon into a large bowl.
Add yogurt, crème fraîche, water or tea and white wine and stir well. Fold in the diced peaches.
Chill in the refrigerator for at least 2 hours before serving.