Place all ingredients into mixing bowl and cook 40 mins / 100°C / speed 3.5, use the simmering basket on top of lid instead of measuring cup.
NON THERMOMIX METHOD
Place all ingredients into a saucepan over med-high heat and gently simmer for 40 minutes stirring regularly (every 2 minutes or so). Remove from heat once caramel has thickened slightly.
I probably wouldn't attempt this recipe without a Thermomix, unless you are very patient!