Avocado and pistachio cake

Name: Avocado and pistachio cake
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: American
Ingredients: 1/2 cup (70g) pistachios; 70g butter, at room temperature; 1 cup (220g) caster sugar; 1 large ripe avocado, peeled, stoned, mashed (about 180g mashed avocado); 1 teaspoon almond extract; 4 Coles Brand Australian Free Range Eggs; 1/2 cup (75g) self-raising flour; 1/2 cup (75g) plain flour; 1/2 cup (60g) almond meal; 3/4 cup (120g) icing sugar mixture; 2 teaspoons lemon juice; Pistachios, extra, chopped, to serve