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Method
step 1
Grease a 20cm X 20cm tin/dish and line with baking parchment.
step 2
Place the white and dark chocolate, the condensed milk and the butter in an ovenproof bowl and place over a saucepan of shallow simmering water. Ensure that the bowl does not touch the water. When the ingredients have melted, stir to combine. Leave to cool for 10 mins.
step 3
Place the remaining ingredients in a large mixing bowl. Add the chocolate mixture and quickly stir to combine. Pour into the tin/dish and even out with the back of a spoon. Refrigerate for at least four hours.
step 4
When the rocky road slab has set, loosen the edges with a knife and turn out onto a board. Cut into 3-4cm squares and dust with sieved icing sugar.