500g brown sugar
a dash of vanilla extract
1. Start warming up the milk in a saucepan on a medium-low fire.
2. Gradually whisk in the brown sugar and add the vanilla extract.
3. Keep whisking regularly while the mixture is heating up. It can bubble up gently but do not let it completely boil (you all know the milk boiling over effect, well, add stickiness from the sugar to that... Hello clean up!).
In the meantime, put some baking paper in a rectangular dish pan, covering the bottom and sides.
The mixture should reduce and thicken. This could take a while (mine took 2:30hrs!).
You know you're nearly done when it has reduced by at least 2/3, and it looks like this (skin forming on top, bubbles that look like they're coming through something solid).
4. When you start feeling some resistance while whisking, it's good to go. Pour it into the prepared pan (watch out for burning splatter!)
Casualties: no burn on my side, but I did break my whisk!
Oh, one last little tip: clean your pan and utensils immediately after you're done, and with plenty of hot water. If you let the fudge rests harden, your pan is lost!