For the filling:

1. Bring the peas to a boil in salted water until tender. Drain.

2. In a robot, chop the onion and then add the peas and half of the sesame. Season with salt and pepper, and reserve in the refrigerator.

3. Space out the pastry squares on the work surface.

4. Place a small spoonful of filling in the center and humidify the edges of the pastry squares with your finger.

5. Close by sticking the pastry to itself.

For cooking:

6. In a bamboo steamer, place cabbage or lettuce leaves on the bottom and stack the buns. Steam cook for 5 minutes.

7. Meanwhile, heat the broth and season.

8. Pour the broth, add the steamed buns, and garnish with roasted sesame.