Mix the blackberries and blueberries with the icing sugar, cover and set aside.
Place the flour and all the other ingredients up to and including the sodium bicarbonate in a bowl, mix and make a well in the centre. Combine the buttermilk, eggs and butter, gradually pour into the well while whisking, continue whisking until the batter is smooth.
Heat the clarified butter in a non-stick frying pan. Pour as much batter into the pan as it takes to make pancakes of approx. 7 cm in diameter. Reduce the heat. Cook for approx. 1½ mins. until the undersides separate from the pan, toss the pancakes, cook for approx. 1 min., cover and keep warm. Prepare the remaining pancakes straight away. Serve the pancakes with the berries, dust with icing sugar.