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Put the potatoes in a pan of cold salted water. Bring to the boil, then simmer gently for about 5 mins or until they begin to crack but are still firm (like par-boiling roast potatoes). Drain and spread out on a baking tray. Put in the fridge and leave to cool for at least 1 hr.
Heat the oil in a large, heavy-bottomed pan or deep-fat fryer to 130C or until a piece of bread browns in 1 min. Put the cooled potatoes in the hot oil and cook for 4-6 mins until they become soft and begin to brown slightly. You can cook all the chips together, but keep checking the temperature of the oil. Remove the chips with a slotted spoon. Drain on kitchen paper, then put back on the baking tray and chill in the fridge for 1 hr.
Reheat the oil to 190C or until a piece of bread browns in 15 secs. Lower the chips into the hot oil and deep-fry for 4 mins until they are browned and super-crisp. Lift the chips out of the oil with a slotted spoon onto a plate lined with kitchen paper to drain. Sprinkle with salt.
Meanwhile, get the duck fat nice and hot in a large frying pan before cracking in the eggs. Fry them gently at first, then turn up the heat if you like the whites crisp. Season generously.
Divide the ham between two plates with the fried eggs, a good spoonful of brown sauce and a generous portion of the triple-cooked chips. Cheers, Dad!