Add the gelatin to a quarter cup of milk and set it aside.
Whisk the egg yolks, sugar, and vanilla in a mixing bowl.
In a small saucepan, simmer a quarter cup of milk. This is a new serving of milk, not the gelatin mixture.
Pour the warmed milk into the egg mixture and whisk.
Pour the egg mixture back into the saucepan, stirring it for about two minutes on low heat.
Pour the gelatin mixture into the pot and stir.
Once the custard has thickened, set it aside and prepare the tea.
Add the large and small tapioca pearls to a glass.
Add a couple of ice cubes.
Pour the milk tea over the ice cubes.
Top with grass jelly and egg custard pudding. Serve, and enjoy!