Drain tuna well. Puree the salad cream, sour cream and tuna with the blender. Season to taste with salt, pepper and lemon juice. Cover and put in a cool place. Peel and wash the carrots and cut them lengthwise into halves or quarters depending on their thickness. Wash tomatoes and cucumber.
Cut cucumber into small pieces. Put tomatoes and cucumber on wooden skewers. Clean and wash the chicory and remove the leaves. Pour some sauce into the glasses and spread vegetables colourfully on the glasses. Serve the rest of the Tonnato-Mayo