Lemon and pistachio cake

Ingredients

• 50 g ground almonds
• 75 g golden caster sugar
• 75 g icing sugar
• 1 medium egg, white only, lightly beaten
• 100 g pistachios
• 1.8 oz ground almonds
• 2.6 oz golden caster sugar
• 2.6 oz icing sugar
• 3 1/2 oz pistachios
• 175 g butter, softened
• 175 g golden caster sugar
• 2 lemons, finely grated zest only, plus 3 tbsp juice
• 3 medium eggs
• 225 g self-raising flour
• 1 tsp baking powder
• 6.2 oz butter, softened
• 6.2 oz golden caster sugar
• 7.9 oz self-raising flour
• 75 g butter, softened
• 75 g icing sugar, plus extra for dusting
• 1 tbsp lemon juice
• 1 handful chopped pistachios, to decorate
• 2.6 oz butter, softened
• 2.6 oz icing sugar, plus extra for dusting