For the icing
- STEP 1
Heat oven to 180C/160C fan/gas 4 and grease a 12-hole silicone muffin or friand mould, then dust with a little flour, and tip out the excess (a metal tray will work too, but line with muffin cases, as the mixture may stick). Put the pistachios in a food processor and blitz until finely chopped but not greasy. Add the remaining cake ingredients and blend again into a creamy mixture. Use 2 spoons to fill each hole of your tray 2/3 full, place on the middle shelf of the oven and bake for 15 mins or until a skewer inserted comes out clean. Leave to cool in the mould for 10 mins, then run a knife around the edge of each cake and turn out onto a wire rack.
- STEP 2
Meanwhile, make the icing. Using an electric hand whisk, blend 3 tbsp of the cream cheese with the butter until smooth, then add the remaining cream cheese and icing sugar. Whizz again until creamy, transfer to a piping bag fitted with a small round nozzle, and chill until ready to use.
- STEP 3
When the cakes are cool, pipe spikes of icing on top of each one, then sprinkle with chopped pistachios. Can be made ahead – store the un-iced cakes in a sealed container for up to 3 days and chill the icing for 2 days.