Step 1

Grease a medium sized non-stick slice pan.

Step 2

Add the sugar, milk, butter and the condensed milk to a large non stick pan and turn the heat on medium-high.

Step 3

Keep stirring as the mixture comes to the boil. If you start getting brownish streaks, turn the heat down a little, and keep up stirring. Unfortunately, if you get black streaks it's burnt. I find using a whisk useful to stir the mixture.

Step 4

When it begins to boil, turn the heat down low and stir it occasionally to stop it sticking. As you continue to cook the mixture, you will notice it will start to darken in colour. You want to keep cooking the mixture until it starts to thicken slightly (about 20 minutes). I recommend keeping a teaspoon, knife and plate nearby. Occasionally take spoonfuls of the mixture and dollop it onto the plate and then spread it out with the knife. If you notice that you can see the grooves of the knife remaining in the mixture after you spread it it's getting close. Let the mix on the plate cool slightly and taste it, if it's really chewy then you are pretty much there.

Step 5

When the mixture is ready you will pour it into the pan. You will need to do this very quickly because as soon as you remove it from the heat it will start to set. Try to get as much of the mix out of the pot and into the pan by scraping the pot. Roll the pan from side to side to spread the mix evenly in the pan. Set aside to cool (be careful as it will be VERY hot).

Step 6

Once the mixture is set cut into small squares.