This is a decadent toffee, covered in white chocolate and chopped macadamia nuts, with a little bit of sea salt to bring it all to the next level. Use dark or milk chocolate for equally delicious results!
Patience is important - do not raise the temperature higher than medium and only stir occasionally once the mixture starts to boil to ensure that the butter and sugar do not separate.
A sugar thermometer isn't required but is extremely helpful in ensuring reliable results.
This is also great with dark or milk chocolate and using almonds, hazelnuts or pecans.