Add the four cups of milk to a heavy bottomed saucepan (use a large sized saucepan) and bring the milk to a boil. Stir in between to make sure the milk is not getting burnt at the bottom of the pan.
Once the milk starts boiling, add the roasted vermicelli also to the pan and mix well. The vermicelli will form clusters if you do not mix them in, so make sure to stir them in well with the milk.
Bring the vermicelli milk mixture to a boil (this starts boiling soon since the milk is already boiled and hot).
Once the mixture begins to boil, reduce the heat to medium and cook the vermicelli until it's cooked.
This takes around 3 to 4 minutes time for regular vermicelli. If the vermicelli that you use is fine variety, it will cook faster so make sure to keep watching!
Also make sure to keep stirring so the mixture won't burn.
Once it's done, switch off the stove, add the sweetened condensed milk, mix in with the cooked vermicelli milk mixture.
Also add more chilled milk (about 2 cups is what I use) to the vermicelli pudding to adjust the consistency of the pudding to your preference.
The delicious & easy 3 ingredient vermicelli pudding is ready! You may serve this warm or you can cool this down to room temperature and chill in the refrigerator to serve it cold!