Rhubarb and Apple Crumble

Ingredients

• 5 granny smith apples, peeled, cored, chopped
• 1/3 cup caster sugar
• 1/2 tsp ground cinnamon
• 1 tsp finely grated lemon rind
• 6 rhubarb stems, trimmed, cut into 3cm pieces
• 2 tsp plain flour
• 1 cup rolled oats
• 1/2 cup plain flour, extra if needed
• 1/2 cup brown sugar
• 80g butter, chilled, chopped
• 1/4 cup flaked almonds
• Icing sugar, to serve