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Balsamic Vinegar, once simmered will reduce to almost half so the more you use the more glaze you will obviously have. If it's the first time that you are making it then perhaps try a smaller quantity as suggested in the recipe. The more you use it, over time you will find yourself adding it to more and more meals and snacks and you will end up making more on your next batch. When I make balsamic glaze I use the entire bottle which is a 500ml because we use it on just about everything and also it lasts a long time. Glass jar in the fridge.Watch it on the stove so it doesn't burn! If balsamic vinegar burns you can't fix it into a glaze.