How do I make food that require different steaming time?

1) Put the food that requires the longest steaming time in steaming bowl 1.

2) Put the lid on the bowl and start cooking.

When the timer reaches the time required for the food with a shorter steaming time:

3) Put food in steaming bowl 2.

4) Remove the lid with oven gloves.

5) Put steaming bowl 2 on top of steaming bowl 1.

6) Put the lid on steaming bowl 2 and simply continue steaming.