Clean the fennel, set aside for garnish. Wash the bulb, cut in half and cut into strips. Peel the pear, cut into eighths, core and cut across into thin slices. Clean and wash the spring onions and cut into fine rings.
For the dressing, mix together the crème fraîche, cream cheese, tomato ketchup and vinegar. Season the dressing with salt, pepper and sugar to taste.
Mix the fennel, pear and onion rings and mix with the dressing. Divide the salad between cocktail glasses and garnish with fennel greens.