Start by washing and drying 6 medium-sized apples. Insert a stick into the top of each apple.
In a heavy-bottomed saucepan, add 200 grams of granulated sugar, 90 grams of unsalted butter, and 120 ml of heavy cream. Heat the mixture over medium heat until the sugar has completely dissolved.
Continue to cook the mixture, without stirring, until it reaches a temperature of 120 degrees Celsius. This is the "hard ball" stage in candy making, and it will ensure that your caramel sets properly.
Remove the caramel from the heat and let it cool for about 2 minutes. Then, dip each apple into the caramel, making sure it's fully coated.
Place the caramel-coated apples on a tray lined with parchment paper and let them cool completely before serving.