Step #3 Put the milk ( or milk / cream mixture) into a non-stick saucepan with the leeks & bring to the boil.
Step #4 If you like your leeks soft rather than slightly crisp, let them boil for a min or two.
Step #5 Remove the leeks (leaving the milk in the pan) & put them into a baking dish.
Step #6 Put the eggs cold into boiling water & cook for exactly five mins.
Step #7 Remove, cool & shell.
Step #8 The eggs should be soft in the middle but the whites will be firm.
Step #9 Lay the shelled eggs on the leeks.
Step #10 Make a white sauce by whisking in the cornflour, salt and butter & bring carefully to the boil while you whisk.
Step #11 When the sauce is smooth, thick & glossy, pour it over the eggs & leeks, Sprinkle top the top this with nutmeg & grated cheese & put it under the grill until it is hot & bubbling.
Step #12 Don't leave it too long or the eggs will be over-cooked.
Step #13 Serve at once with lots of crusty bread and butter.