Classic apple streusel cake - Better Homes & Gardens Australia

Ingredients

• 2 medium pink lady apples, peeled, cut into 1cm pieces
• 1 1/2 tsp cinnamon, plus 2 tsp extra
• 1/2 tsp mixed spice
• 1 Tbsp lemon juice
• 1 Tbsp brown sugar, plus 1/2 cup extra
• 10g unsalted butter, plus 100g extra, at room temperature
• 1 Tbsp finely grated lemon zest
• 2 free-range eggs
• 200g sour cream, room temperature
• 1 cup self-raising flour, sifted
• Double cream, to serve
• Streusel topping
• 70g unsalted butter
• 1/2 cup plain flour
• 2 Tbsp rolled oats
• 1 1/2 Tbsp brown sugar
• 1/2 tsp cinnamon
• 1/3 cup skinless hazelnuts, chopped
• Lemon icing
• 1/2 cup pure icing sugar, sifted
• 1–2 tsp lemon juice