Question

Why does your mother put metal ladle in the saucepan while boiling milk?

Answer 1

It is a simple technique is used to prevent the overflow of milk when boiling.
put a long-handled spoon into the pot as it is heating. The spoon breaks the surface tension and the skim of milk fat and protein forming and allows the steam to escape without violently erupting.
Due to this we can prevent the overflow of milk.