Beef and horseradish canapés

Name: Beef and horseradish canapés
Prep time: 15 min
Cook time: 5 min
Total time: 20 min
Yield: Makes 32
Ingredients: 60 ml (2 fl oz) cream, lightly whipped or sour cream; 150 g (5 oz) rare roasted beef, finely chopped; 30 g (1 oz) fresh horseradish, finely grated or 2 teaspoons horseradish cream; fresh chervil sprigs, to garnish; 8 thin slices day-old white or brown bread