Apple ginger shortcake

Ingredients

• 1 1/4 cup self-raising flour
• 1 1/2 tablespoon cornflour
• 3 tablespoons caster sugar
• 3 tablespoons low-fat margarine
• 2 egg whites
• 1 1/2 tablespoon lemon juice
• 410 grams canned apple pie filling
• 1 1/2 tablespoon passion-fruit pulp (1 passion fruit)
• 1 teaspoon finely chopped glacé ginger
• 1 teaspoon finely grated lemon rind
• 4 tablespoons water, for brushing
• 3 tablespoons icing sugar
• 2 teaspoons ground cinnamon