ianandluis.blogspot.com on making your own balsamic vinegar
Decant a third of the 750ml bottle of vinegar to make space. Add, a generous sprig of sage, thyme and rosemary. Place 15 black peppercorns, 20 coriander seeds, 12 cloves and 15 cardamom seeds in the bottle along with 30 raisins. Top up the bottle with the remaining vinegar, seal and store in a cool dark place for 2 months. The colour will change slightly as the herbs and spices infuse with the vinegar. Decant and discard the herbs and spices and use as required. We make about 3-4 litres a year for personal use and occasionally a few extra bottles for gifts to friends and family.