Orange chiffon cake - Better Homes & Gardens Australia

Ingredients

• 2 cups self-raising flour
• 7 free range eggs, at room temperature, separated
• 3/4 cup caster sugar, plus extra 3/4 cup
• 3/4 cup orange juice
• 1/2 cup vegetable oil
• 1 Tbsp finely grated orange zest
• 1/2 tsp cream of tartar
• Edible flowers, to decorate
• Filling
• 600ml thickened cream
• 400g sour cream
• 1/4 cup icing sugar mixture, sifted, plus extra, to dust
• 1 Tbsp vanilla extract