On a floured surface, roll out half the pastry to a 14 inch square and about ⅛ of an inch. Use a 6 inch round plate to cut 4 rounds.
Place them on a baking sheet lightly sprinkled with water.
Make for more rounds with the remaining dough and place them on another baking sheet. Prick with a fork avoiding edges. Chill for 15 minutes.
Cut the marzipan into 8 equal portions and roll them into balls.
Set one of the marzipan balls between two sheets of parchment paper and roll out to a 5 inch circle. Place on top of a pastry round and repeat with remaining marzipan. Chill for another 15 minutes.
Preheat oven to 425F. Toss the apples in lemon juice and arrange them over the marzipan in a spiral overlapping circle.
Note: I didn't have marzipan so I used a fruit preserve.
Bake for 15 - 20 minutes until the edges have risen. Sprinkle the apples with sugar and return Galettes to the oven.
Bake another 5 - 10 minutes.
Dust with confectioners sugar and serve warm with whipped cream or ice cream if desired.
Recipe by SIMPLY BEAUTIFUL EATING at https://simplybeautifuleating.com/2016/02/02/desserts-the-galettes/