Bring a pot of water to a boil
Add 100g of tapioca pearls, boil for 1 minute using a timer. Turn off heat and cover with a lid. Wait for 15 minutes
After 15 minutes, check if tapioca is cooked (it’s cooked when they turn completely transparent). If you still see white in the pearls, put the cover back on and wait for another 5 minutes
Drain tapioca in a colander and rinse with cold water
Submerse the tapioca in cold water until ready to use to prevent clumping
Combine 1 whole egg and 2 egg yolks in a mixing bowl and add 2 tbsp sugar. Whisk until smooth
Add 30g corn starch and whisk until smooth. Set aside
In a sauce pan, add 250ml of milk and add 3 tbsp sugar. The sugar will help prevent scorching
Bring the milk to a boil and pour ¼ of it into the egg mixture. Mix quickly until smooth
Add the rest of the milk to the egg mixture. Mix until smooth
Pour the egg mixture into the sauce pan
Turn heat on medium-high
Whisk vigorously until mixture thickens and is smooth. Turn off heat. Shamefully, I have never been able to make the custard completely smooth. I don’t think I whisk fast enough. This recipe is very forgiving though. Once you add the tapioca, you won’t notice any lumps.
Add 1 tsp vanilla extract and 20g unsalted butter. Mix well
Drain the tapioca pearls. Shake off excess water and pour into the custard. Mix well
Scoop half of the tapioca custard and spread it evenly on the bottom of the pie pan
Spread the black sesame paste on top of the tapioca custard It may be difficult to spread since the custard is soft so you may want to add dollops of the black sesame paste instead
Cover with the remaining half of the tapioca custard. Spread it out evenly
Take the crispy topping out of the fridge, unwrap the plastic wrap and place it on top
Beat 1 egg and brush egg onto the top of the crust
Bake at 200˚C or 400˚F for 20 minutes
Let cool for 5 minutes before serving