First of all, I recommend cooking flavored milk. Of course, you can skip this step and just use milk. But, with fragrant milk is very tasty.
So: in a saucepan with a thick bottom, pour the milk, add salt, Bay leaf, black pepper and nutmeg. 1 onion, cut in half. Put on the stove and bring to a boil. Then reduce the heat to a minimum and boil for another 5 minutes. Turn off, cover with a lid, and let it infuse for 20 minutes. Before using, strain the milk, removing the onion and Bay leaf.