Gently fold in the remaining flour – do not overmix and knock the air out of your mixture. Stir in the pistachios and poppy seeds.
Pour the mixture into the prepared tin and smooth the top.
Bake for 35 to 40 minutes, until a skewer inserted into the centre comes out clean. Once baked, place the tin on a cooling rack. Leave for 10 minutes and then carefully invert onto the rack and remove the tin, it should just slide off the cake.
Once the cake has fully cooled, melt the white chocolate with the cream in a bain-marie. Stir from time to time until the chocolate has melted and is well combined with the cream.
Drizzle the melted chocolate over the cake, allowing it to flow over the cake. Sprinkle with the chopped pistachio nuts and poppy seeds then leave the chocolate to set.
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