4-6 medium Kerr's Pink potatoes or other floury potato
30g/1oz freshly grated horseradish
a few drops lemon juice
48 sprigs watercress
60ml/2fl oz mayonnaise
paprika, to dust
small pinch salt
vegetable oil, for frying
4 tbsp cr猫me fra卯che
12 thin slices oak-smoked salmon