* Finely grate the radish, mix with salt and infuse for 2 hours. * Squeeze the radish in a clean dish, collecting the juice. * Mix well with mustard, yogurt, vegetable soup and crème fraîche with a hand mixer.
* Season with salt, pepper and a pinch of sugar.
* Arrange the cold radish soup in four plates, add the grated radish.
* Cut the tuna and salmon into thin slices and place them decoratively on the soup.
* Drizzle with a little olive oil, sprinkle with sea salt and pepper.
Tip: Use creamy natural yogurt for an even finer result!