Put the chopped apple (with skin), gooseberry, beetroot in a deep non-stick saucepan with 1 & 1/2 cups of water. Cook, it covered for 10 minutes on medium-high flame.
Switch off the flame and allow to cool down completely.
Grind boiled apple, gooseberry, and beetroot into a smooth puree. It yields 2 & 1/2 cups of puree.