Take the Puff Pastry out of the fridge directly. Remove from package and fold the Puff Pastry into a long roll shape. Cut the pastry into 12 equal pieces.
Place each piece into the Muffin Tin. Use your thumb and fingertips to spread the pastry and fit the size of each tin.
Prick the bottom of each tart dough. Refrigerate the Pie Crust dough for at least 30 minutes while preparing the Tart Filling.
Prepare the Tart Filling
First prepare the Sugar Syrup. On medium heat, in a saucepan, heat up the Water and Sugar until the Sugar is fully dissolved.
Add in Lemon Peels and the Cinnamon Stick. Simmer on medium heat for 3-5 minutes.
Sift the Sugar Syrup (take out the Lemon Peels and the Cinnamon Stick) into another bowl. Set aside and let cool.
In a glass bowl, whisk together the Cornstarch, Salt, and 1/3 of Sweet Whole Milk.
Add the rest of the Milk into a saucepan on medium heat. When the Milk is about to boil at the edges, add in the Cornstarch mixture. Whisk constantly until you have a slightly thickened texture. It will take 3-5 minutes.
Remove from heat. Let cool for a few minutes. Then add in the Sugar Syrup and Vanilla Paste. Combine well.
In another bowl, use a ladle to add the warm milk mixture slowly into the Egg Yolks. Quickly whisk them together to avoid the yolks scrambling. Whisk until the texture is smooth.
Then pour the mixture into the pot and mix well together.
Use a strainer to strain the tart filling into a measuring cup. Set aside.
Take the Tart Crust out from the fridge. Add in the filling up to about 90% close to the top of each tart.
Bake the Egg Tarts
Bake the Egg Tarts in a preheated oven at 200 C (392 F) for 10 minutes. Then lower the heat to 180 C (356 F) and bake for another 15-20 minutes.
Let the Egg Tarts cool down on a rack before removing from the Muffin Tin.
Serve while warm.
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Noter
It's important to keep the Puff Pastry cold before baking.
You can refrigerate the leftover Egg Tarts in the fridge for up to 3 days.