Milk - 3 cup,
Sugar - 3/4 cup.
Rinse a heavy bottom pan with water. Add milk followed by sugar.
Dissolve sugar over medium high flame with stirring occasionally. Give it a boil.
Now reduce heat to medium, cook mixture roughly about 40 to 45 minutes with occasional stirring.
Now milk has reduced by half and thickens slightly.
At this point, you may see some layer forming on top. Do not stir, but gently remove with the help of a spoon. Stirring mixture at this point leads crystals in condensed milk.
When mixture reduced by 1/3, condensed milk is ready. Once ready, turn off the flame and remove from the heat.
Sieve prepared mixture for smooth texture.
Let it come to room temperature. Transfer into a refrigerator safe airtight glass container. Keeping in the fridge for 2 to 3 hours makes the mixture thicker.
Refrigerate and use prepared condensed milk up to 20 to 25 days.
Adjust amount of sugar as per taste.
Cooking time may vary according to the size and type of stove and cooking utensil.
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