Keep 500ml / 2½ cup milk for boiling in any heavy bottomed pan. Let it come to boil. Keep ¼ Cup to make Custard powder slurry.
2¼+¼ Cup Milk
Take ¼ cup milk in a bowl to it add 3-4 Tbsp of custard powder to it and mix, make a lump free slurry.
3 tbsp Custard powder
Add to the boiling milk and stir it. Milk will start to thicken and this is your base custard. Take care that no lumps are formed.
Lower flame and cook.
When custard coats the back of ladle then it is ready. It will take about 5mins.
Add sugar(about 1/4 cup or as required) to it and stir nicely. Keep on stirring, take care not to burn the milk at bottom.
¼ Cup Sugar
Once custard thickens to desired consistency, this will take another 2 minutes. Take off the pan from flame and transfer to a serving bowl to cool.
To avoid skin getting formed on it, let the custard cool a bit and then cover the bowl with a lid or cling film.
Refrigerate to chill for a couple of hours before serving.