Grape Juice, Step 2

After picking the grapes from the vines, I washed them and then cooked them for about 20 minutes.  I mashed them while they cooked to bring the juice out.  (No water added)  I shouldn't have added the green grapes (rookie mistake) because in the end I have to add some sugar to the finished product.  If I had only used red grapes, the sugar wouldn't have been necessary.  This pic shows all of the grapes from the previous pic in one pot, and in the end it produced one jug of juice.