Steps

1. Core and peel 1 Fuji apple (approx. 350g), then cut into 4 wedges.
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2. Slice the peeled apple halves into 1cm thick pieces.
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3. In a microwave-safe bowl, combine the sliced apples, 2.5 tbsp Granulated Sugar, 1/2 tbsp Lemon Juice, and finely chopped 10g Unsalted Butter. Mix well.
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4. Microwave on 600W for 3 minutes without covering.
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5. Remove from the microwave and mix thoroughly.
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6. Microwave again on 600W for 5 minutes without covering.
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7. If there's excess liquid after microwaving, heat for an additional 1 minute on 600W to evaporate the moisture. Adjust heating time based on the apple variety and condition, as it may vary.
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8. Add Cinnamon Powder (to taste) and mix well.
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9. Cover the filling tightly with plastic wrap to prevent drying and let it cool completely.
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10. In a bowl, whisk together 1 Egg Yolk and 1 tsp Water to make an egg wash. If using whole egg, water is not necessary.
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11. Cut 1 sheet of Frozen Puff Pastry into 3 equal pieces. It should be firm enough to cut with the tip of a knife. Be careful not to let it become too soft, as it will be difficult to work with.
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12. On the puff pastry pieces that will be the top crust, make 5 slits in the center, leaving a 1cm border from the edges. Process the remaining puff pastry pieces similarly.
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13. Lay plastic wrap on a cutting board and place a puff pastry piece without slits on it. This prevents the frozen puff pastry from sticking to the cutting board.
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14. Spread the cooled apple filling on the base puff pastry, leaving a 1cm border.
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15. Brush the edges with the egg wash, then place the slit puff pastry on top. Press the edges firmly with your fingers.
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16. Use a fork to press down on the edges, sealing the top and bottom puff pastry together.
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17. Line a baking sheet with parchment paper and arrange the formed apple pies on it.
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18. Brush the surface of the apple pies with the egg wash.
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19. Bake in a preheated oven at 200℃ (390°F) for 20 to 25 minutes, or until golden brown. Adjust baking time based on your oven, as the browning may vary. Ensure at least 20 minutes of baking time.
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20. Let cool slightly after baking.
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