Chocolate Tiffin - cooking recipe

Ingredients

1/2 cup butter
2 tablespoons white sugar
2 tablespoons golden syrup
4 teaspoons cocoa powder
1 (8 ounce) package rich tea biscuits, crushed
1/4 cup raisins, or to taste
7 ounces milk chocolate chips
7 ounces dark chocolate chips

Preparation

Combine butter, sugar, golden syrup, and cocoa powder in a saucepan over medium-low heat; cook and stir until smooth, 2 to 4 minutes. Stir in biscuits and raisins. Pour mixture onto a rimmed 8 x 12-inch jelly roll pan; press to flatten.
Melt milk chocolate and dark chocolate in top of a double boiler over simmering water, stirring frequently and scraping down the sides with a rubber spatula to avoid scorching, 3 to 4 minutes. Pour melted chocolate over base in the jelly roll pan.
Refrigerate until set, about 1 hour. Cut into 20 pieces.