Pre-heat oven to 200°C (400°F). Line a large baking sheet with baking paper.
To prepare frangipane, mix all ingredients in a medium bowl with a spoon until it forms a thick smooth paste.
Score a 1cm border in the pastry round. Spread the frangipane inside this border all over the pastry round. Arrange apple slices in a circle. Sprinkle with extra raw sugar. Bake in the pre-heated oven for approximately 18 minutes until golden and crisp.
Remove from oven. Dust with icing sugar. Cut into slices and serve warm with vanilla ice cream.
Notes
I bake using a convection oven setting. If baking in a fan-forced oven, reduce oven temperature by approximately 20°C (68F).
Make sure you remove the seeds of the apple after slicing it thinly.