Preheat the oven to Gas 7, 220°C, fan 200°C.
Finely slice the apple halves into equal size pieces, put in a bowl and gently toss with lemon juice to stop them going brown.
On a floured surface, roll out the pastry, and cut 10cm rounds with a pastry cutter or round a saucer with a knife. Or do the same with the ready rolled pastry. Place on a buttered baking tray. Arrange the apple slices on top in a circle, slightly overlapping and almost to the edge of the pastry. Brush with a little melted butter, then sprinkle with the caster sugar and cinnamon. Bake for 15-18 minutes until golden. Cool slightly.
Dust each tart with icing sugar. Serve warm with custard or vanilla ice cream.
Freezing and defrosting guidelines
Once the dish has cooled completely, transfer it to an airtight, freezer-safe container, seal and freeze for up to 1-3 months. To serve, defrost thoroughly in the fridge overnight. Loosely cover with foil and bake until dish is thoroughly heated through if wanting to serve warm.
See more Dessert recipes