Slowly pour the egg mixture over the onions and bake for 30 minutes, or until the tart is golden and just set; it shouldn’t wobble too much in the centre. Leave for about 10 minutes so it can ...

Pour the milk onto the egg yolk mixture and stir well, creating little bubbles. Transfer the custard mixture into a pouring jug with a lip, then fill each of the tart cases. Sprinkle a small pinch ...