To make the cake – In a pan roast the Pistachios very lightly. They just need to get warm, and not change colour. Cool them and pulse them to a fine powder in a blender. Preheat oven to 200 C for 10 mins.

In a bowl cream the butter, oil  and sugar with a beater. Now add half the amount of Pistachio powder and half the amount of flour and beat. Add the remaining Pista powder, baking powder, and flour and beat again until combined. The mixture will appear a little dry.

Now add one egg at a time and beat to combine. Finally, add the lemon zest and vanilla essence and give a finally spin with the beater. Now using a spatula, scrape the sides and stir just once. The cake batter is ready.

Grease a circular cake mold or Loaf pan, and pour the cake batter into it. Tap once gently to remove any air gaps and put it in the oven for 15 to 20 minutes. Since each oven has a different setting, keep checking for fineness from 15 minutes onward. The cake is done when a toothpick inserted in the center comes out clean.

To Make the glaze-- Bring the White chocolate to room temperature. Take the chocolate in a bowl, add 2 tbsp cream and put it in the microwave for 30 seconds. Bring it out and stir vigorously so that the melted white chocolate combines with the cream evenly. Cool it for 10 minutes.

In the meanwhile, take the chilled cream in a bowl, add the castor sugar and start beating until it turns airy and forms soft peaks. Once soft peaks form, don’t whip it any more. Add the white chocolate mixture and gently fold it in with a spatula. Put it in the fridge until further use.