Parle G Biscuits which are manufactured by Parles in India. They are more than 50 years old and have been rated as the largest selling Glucose biscuit in the whole world in terms of volume.
This biscuit is one of the cheapest and tastiest. I always buy a packet or two when I am travelling by train as they are not only tasty but also nutritious. As the famous advertisement goes swaad bhare, swaasthya bhara aptly describes this biscuit.
This biscuit is recommended by doctors for convalescing children but you need not worry any age will enjoy this biscuit.
I will end by saying that you should try out this biscuit and once you have bitten it you will always eat it.