01 -
Line a 22 cm x 22 cm square baking pan with parchment paper, ensuring the paper covers all sides for easy removal.
02 -
In a large saucepan, combine granulated sugar, light corn syrup, and kosher salt. Place over medium-high heat and stir continuously with a rubber spatula until the sugar is fully dissolved and the mixture starts to gently bubble.
03 -
Slowly pour in the heavy cream in a steady stream while stirring constantly, maintaining the gentle bubble. Take care not to add the cream too quickly to prevent crystallization.
04 -
Once the cream is incorporated and the mixture is smooth, add the cubed unsalted butter, stirring until fully melted and combined.
05 -
Continue stirring and cook the caramel mixture, monitoring closely with a reliable candy thermometer. When the temperature reaches 118°C, immediately remove the saucepan from the heat.
06 -
Stir in the rum extract quickly and pour the hot caramel into the prepared pan, spreading it evenly. Allow the caramel to cool undisturbed at room temperature until firm, about 2–3 hours.
07 -
Once the caramel is completely set, lift it from the pan using the parchment paper. With a sharp, buttered knife, cut into small squares and individually wrap in wax or parchment paper.