A more practical way is to wait for the water to boil, then pour out some of the water into a cup (which you will put back afterwards). This way there is more r

A more practical way is to wait for the water to boil, then pour out some of the water into a cup (which you will put back afterwards). This way there is more room for the coffee to rise and not overflow. Then put coffee in and bring to boil several times. The surface should rise but not separate. Some people even remove the foam altogether to remove the bitterness.