01 -
Coat an 20 cm x 20 cm baking pan with cooking spray. Line with parchment paper, leaving a 5 cm overhang on all sides.
02 -
In a large heatproof bowl set over a saucepan of gently simmering water, melt 340 grams bittersweet chocolate, stirring frequently until smooth. Remove from heat and stir in rice cereal until fully coated.
03 -
Transfer the chocolate-cereal mixture to the prepared pan. Spread evenly with an offset spatula. Refrigerate until set, approximately 30 minutes.
04 -
In a large heavy-bottomed pot over medium heat, cook granulated sugar, stirring constantly, until fully melted and deep amber in colour, about 10 minutes.
05 -
Gradually add heavy cream to the melted sugar, stirring to combine. Add corn syrup and butter. Continue to cook, stirring occasionally, ensuring mixture does not stick to the bottom, until the sugar is dissolved and a thermometer registers 118-120°C. This may take up to 45 minutes.
06 -
Stir in vanilla extract and a pinch of kosher salt. Allow caramel to cool slightly for about one minute. Spread evenly over the chilled chocolate crunch layer with an offset spatula.
07 -
Place 170 grams chopped chocolate in a medium heatproof bowl. In a small saucepan, bring 180 millilitres heavy cream to a boil. Pour hot cream over chocolate and let sit for 2 minutes before whisking until smooth and glossy. Cool slightly.
08 -
Spread ganache evenly over caramel layer using an offset spatula. Cover and refrigerate until top is set, about 45 minutes.
09 -
Using the parchment overhang, lift the bars out of the pan. Place on a cutting board and cut into squares.