Pour half of the sugar into a saucepan. Heat over medium heat until the sugar melts and starts to colour.
Add the glucose syrup and mix. Then add the rest of the sugar.
Cook until all is melted (overlooking to avoid the caramel to burn). At the same time, heat the cream.
Once the caramel is ready, remove the pan from the heat and pour the hot cream in small quantities while stirring (watch out for hot splashes). If you have small complex pieces in your caramel, put it back on the heat a little to melt them.
Remove from the heat, add the butter and mix with a hand blender.