Put in the mixer with the tuna and mayonnaise and mix well. Season with salt. Put the mousse in a round serving dish, then let it rest in the fridge for half an hour.
Take the tuna and potato mousse from the fridge and decorate with the pitted black olives, cut in half.
Place the Pringles chips in a radial pattern on the mousse base to form petals. Then serve your sunflower salad.