Recreate the Alind dish "Mirrortack" which has a reputation for being bad! [Ex Astris cuisine]

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I reproduced "Mirrortack" from Ex Astris. In the story, I tried my best to make the Alind cuisine, which has a reputation for being bad, delicious.
◆Croissant dough
▼Materials: 5 pieces
Strong flour 105 g
Cake flour 45 g
Salt 3 g
Granulated sugar 10 g
Dry yeast 1 g
Butter 10 g
Milk 90g
Butter for folding 60 g
1 egg yolk for painting
◆Custard cream and chocolate crunch
▼Ingredients: Amount that can be made with one egg
1 egg
Granulated sugar 60 g
Cornstarch 8 g
Light flour 8 g
Milk 200g
Fresh cream 60 g
Butter 5 g
2 drops vanilla essence or oil
Corn flakes 15 g
White chocolate 20g
◆Nutritional information: 1 piece
・Energy　294 Kcal
・Protein 5.0 g
・Fat 15.8 g
・Carbohydrate 31.5 g
・Salt 0.17 g
*Please preheat the oven to 200℃
*Bake at 180℃ for 20-26 minutes.
*If you brush with egg yolk again about 15 minutes after you start baking, you can get a better baked color.
*If the dough does not stretch properly, chill it again.
*Custard cream is made using one egg, so the finished amount will be about three times the amount of dough.
◆X (Twitter) / kuoh_gohan
◆X (Twitter) / kuoh_gohan
#エクスアストリス　#Ex Astris　　#ツキヨミモッチ 　＃Mirrortack