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Put a plate in the bottom of a large saucepan. Fill the pan with water, clip on a cooking thermometer and bring the temperature to 63°C (113°F) over a medium heat.
Gently lower in the eggs. Keep an eye on the temperature of the water, as you want the eggs to cook for 1 hour at a constant of about 63°C (113°F). A degree or two above or below won’t kill you, but try to find the temperatur