Line a 20 x 30cm tin with nonstick parchment paper, brush it with butter, dust with cocoa powder and set it aside.
Preheat the oven to 170°C.
Put the chocolate, butter and 1 tablespoon of the dulce de leche into a heatproof bowl over a saucepan of simmering water and stir... Discover the recipe at bit.ly/2lhqvQI
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