1. Put the milk, condensed milk and white sugar into the same container, stir them evenly, and heat them until the sugar is completely dissolved.

2. After cooling, add the egg yolk and stir well, and the egg will be finished when it reaches the water.

3. Pour the tart water into the tart skin. Don't fill it to prevent it from overflowing when heating.

4. Bake in the oven (200℃) for about 20 minutes.