01 - Gently heat the apple cider vinegar in a small saucepan over low heat until warm without boiling, then remove from heat.
02 - Place the cinnamon sticks, cloves, allspice berries, black peppercorns, star anise, sliced ginger, and optional orange zest into a sterilized 1-quart glass jar.
03 - Carefully pour the warm vinegar over the spices and aromatics in the jar.
04 - Seal the jar tightly and allow it to cool to room temperature.
05 - Store the jar in a cool, dark place for 1 to 2 weeks, gently shaking every few days to enhance infusion.
06 - After infusion, strain the vinegar through a fine mesh sieve or cheesecloth into a clean container, discarding solids.
07 - Keep the spiced cider vinegar sealed at room temperature or refrigerated, using within six months.