- Grease and line a 20cm x 20cm square tin with baking parchment.
- Place the butter, caster sugar and golden syrup into a large saucepan and heat gently until melted and fully combined.
- Sift in the cocoa powder and stir until smooth.
- Place the biscuits into a food bag and crush into small chunks using a rolling pin.
- Stir the crushed biscuits and Merchant Gourmet Whole Chestnuts into the chocolate mixture until evenly coated.
- Transfer the mixture to the prepared tin and press down firmly using the back of a spoon.
- Place the milk chocolate and dark chocolate into a heatproof bowl and melt gently in the microwave in short bursts, stirring regularly.
- Pour the melted chocolate over the tiffin base and spread evenly.
- Chill in the fridge for 2 hours, or until fully set.
- Cut into squares and store in the fridge until ready to serve.
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