What happens next?

How to make traditional albanian leek soup
Wash, then slice a medium sized leek.
Each slice should be about 2 centimeter (0.8 in) thick.
Add the leek to a saucepan of simmering water.
Keep water simmering and reduce the temperature if the water starts to boil. Halve an onion, remove the skin then chop half of the onion into small cubes.