First take 2 tablespoon Custard Powder in a bowl. Here I am using Vanilla flavoured Custard Powder.
To it add 1/4 cup of Milk. Milk should be cold or warm and not hot or else it will form lumps on mixing.
Mix Custard Powder and Milk continuously and properly making sure that there are no lumps in it and is smooth. Keep it aside.
Now heat 2 cups of Milk in a heavy base kadai or non-stick pan over medium flame.
Heat the Milk till it comes to a boil. Stir the milk occasionally in between so that it does not stick to the bottom of the pan and burn.
When the Milk comes to a boil, add 1/4 cup of Sugar. Stir to dissolve the Sugar completely. You can adjust the quantity of Sugar as per your liking of sweetness.
Now turn the flame into low and add the Custard Powder and Milk mixture into the boiling Milk. Also add Cardamom Powder. Cardamom Powder is optional and you can skip if you want to.
Under low flame cook the Custard Milk by continuously stirring it so that it does not stick at the bottom of the pan. If it sticks, it can change the taste of the custard.
Cook the Custard Milk till it turns thick. The consistency of the Custard should be thick and runny. To check dip a spoon or spatula into it. It must coat the back of the spoon or spatula properly.
When the Custard Milk slightly thickens, switch off the flame and transfer it to a large bowl. Allow it to cool down completely. On cooling it will thicken further.
When the Custard comes to room temperature, cover and keep in refrigerator to chill for about 1 hour.
After an hour take out the Custard from refrigerator. Custard is ready. If you want you can serve it chilled without fruits also. Now we will add Chopped Fruits to prepare Fruit Custard.