Fire Cider is a spicy, pungent herbal tonic or oxymel made by infusing Apple Cider Vinegar with “hot” aromatics like horseradish, ginger, garlic, onions, and peppers. It is primarily used as an immune-system booster and a remedy for congestion and sluggish digestion. You can take it straight as a shot in the morning to wake up your sinuses, further dilute it with hot water and extra honey, or mix it into a salad dressing or marinade. Originally developed by Rosemary Gladstar and her students at the California School of Herbal Studies in the 1970s based on generations of herbal vinegar traditions and creativity.