Chocolate volcanoes

Tins, packets and jars

2 tbsp plain flour

Cooking ingredients

85g/3oz caster sugar

2-3 tbsp cocoa powder, for dusting

Biscuits, snacks and sweets

165g/5Â¾oz dark chocolate (70 percent cocoa solids), chopped into small pieces

Dairy, eggs and chilled

165g/5Â¾oz unsalted butter, cut into small pieces, plus extra for greasing

double cream, to serve

3 medium free-range eggs

3 medium free-range egg yolks

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