1/2 kg black grapes (I used seeded Bangalore grapes)
200 gm sugar
2 spoon ginger grated
Pinch of salt
In 5 LTR pressure cooker add grapes , mash slightly so that it release water.
Add sugar,ginger and pinch of salt don't mix it.
Close lid with weight.
In medium heat or induction at 900 cook for 20 minutes.
Switch off the stove at 20 minutes
Wait till pressure settle.
Open, let it cool and then in strainer, strain it, add little(2 spoon for one batch) boiled water, extract juice discard the peel and seeds.
Let the concentrate come to room temperature then transfer it to air tight bottle.
Store in refrigerator.
How to make juice from concentrate :
Add 1/4 of concentrate and add 3/4 cup of water mix well and serve !
You can increase sugar if you like more sweetness in juice!
Opos technique courtesy : Ramakrishnan sir.