It’s pretty easy, though time-consuming, to make grape juice with a steam-juicer.
1. Wash grapes and load into steamer compartment
2. Fill bottom pan with 3 quarts water and steam grapes for 1 hour
3. Meanwhile, sterilize jars and lids, then fill and seal. No need to process further. Feel very gratified when you hear the little pop of those jars sealing themselves.
4. Major cleanup of various purple ponds and puddles, and of course the little sticky, staining grape juice spots that had an itch to travel and see the world beyond your workspace.