01 - Gently heat the apple cider vinegar in a small saucepan over low heat until hot but not boiling, then remove from heat.
02 - Place cinnamon sticks, cloves, allspice, peppercorns, star anise, sliced ginger, and orange zest if using into a sterilized 1-liter glass jar.
03 - Pour the hot vinegar carefully over the spices and aromatics in the jar.
04 - Seal the jar tightly and allow it to cool to room temperature.
05 - Store the sealed jar in a cool, dark place for 1 to 2 weeks, shaking gently every few days to enhance infusion.
06 - After infusion, strain the vinegar through a fine mesh sieve or cheesecloth into a clean container and discard solids.
07 - Keep the spiced cider vinegar in a sealed container at room temperature or refrigerate for up to 6 months.