1. Place in a bowl with 2 trays of ice cubes. Let stand 3 hours.
2. Bring syrup ingredients to a boil.
3. Drain cukes and onions and add to syrup.
4. Heat just to boiling.
5. Cover and chill. Keep in refrigerator.
Sandor Katz lives to ferment; it’s his life’s work. The author of The Art of Fermentation shares how to make kombucha at home.