Steps

1. In a bowl, add 1/2 egg and 25g granulated sugar, then mix quickly.
   🕒 00:00
2. Add about half of the 100ml milk and mix well.
   🕒 00:09
3. Sift in 1 tbsp all-purpose flour and mix thoroughly.
   🕒 00:14
4. Add the remaining milk and mix again.
   🕒 00:17
5. Finally, add 5 drops vanilla extract and mix. Cover with plastic wrap.
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6. Microwave on 600W for 1 minute 30 seconds, then stir. Cover again with plastic wrap and microwave for 1 minute, then stir. Microwave for another 40 seconds, then stir.
   🕒 00:28
7. Press plastic wrap directly onto the surface and cool in an ice bath.
   🕒 00:50
8. Peel the apple and cut into approximately 1cm cubes.
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9. Place the cut apple in a pot, add 30g granulated sugar and 2 tsp lemon juice, and coat.
   🕒 01:06
10. Add 15g unsalted butter and bring to a heat while melting the butter.
    🕒 01:15
11. Reduce to low heat, cover, and simmer for 10 minutes.
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12. Remove the lid, stir to evaporate the moisture, and cook until desired color is achieved. Once reduced, remove from heat, press plastic wrap directly onto the surface, and let cool.
    🕒 01:29
13. Cut the frozen pie dough into 4 equal portions.
    🕒 01:48
14. For the top crust, make cuts with a 1cm margin from the top and bottom edges.
    🕒 01:56
15. In a bowl, combine 1/2 egg and 1 tsp water, and mix well to create an egg wash.
    🕒 02:03
16. Apply egg wash to the edges of the bottom pie crust.
    🕒 02:11
17. Place the chilled custard cream on top.
    🕒 02:13
18. Add the chilled apple filling over the custard.
    🕒 02:18
19. Cover with the pie crust that has cuts, and press the edges with a fork to seal the top and bottom crusts together.
    🕒 02:20
20. Place on a baking sheet lined with parchment paper and brush the surface with egg wash.
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21. Bake in a preheated oven at 200°C (390°F) for 15 to 20 minutes.
    🕒 02:31