1: Preheat the oven to 390°F (200°C) Put 250 ml whole milk, 100 g caster sugar and 75 g butter into a pan. Bring to the boil over medium heat.
2: Turn the heat down and tip in 150 g flour all at once. Beat vigorously with a wooden spoon until the dough collects into a ball. Remove the pan from the heat and leave to cool for 5 minutes. You can transfer the dough to a bowl now if you prefer.
3: Add 3 eggs one at a time, mixing well as you add each one...