Peel the boiled eggs and set aside. Melt the butter in a frying pan over a moderate heat and add the chopped leek, garlic, mace and shallot. Fry for 5 minutes, until softened.
Place the sausage meat into a large bowl and add the softened leek mixture. Stir in the chopped parsley; add 1 of the eggs and season with salt and freshly ground black pepper. Pack this mixture around each egg to form a generous coating of sausage meat.
Season the flour and beat the remaining egg with a little water. Roll the eggs in the seasoned flour and then dip briefly into the egg.
Roll the eggs in the breadcrumb until coated.
Heat the oil in a deep fat fryer to 180°C. Deep-fry the eggs for 5 minutes and then transfer to the oven and cook for another 5 minutes.
Cut each egg in half and serve with fresh salad leaves, sliced baby beetroot, and a little French dressing.