I just meet someone who who produces hydrosols, and after asking her about the process, I showed her a diagram of a steam juicer.
She noted that a steam juicer passes the condensate back through the organic material, where as the hydrosol still does not.
She wasn't sure what to think if this difference.
Either process might leave the stems in place, rather than separating them out.
Separating stems from Elderberry is kind of labor intensive, so these firms of processing seem useful.
Is stem juicing a good way to process elderberry?
What about hydrosol distillation?
If either are good, can the stems be included in the process?
I have been using a steam juicer to make elderberry juice for elderberry syrup for over 30 years. Works quite well. Freeze the berry clusters them striping them off the stem is easy. Keeping the heat low under the pan ensures a good juice.
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