Rowan jam with apples

Food should be not only delicious, but also healthy. At the moment when vitamins were discovered, humanity entered a new era, and cooks and cooks began to puzzle over how to preserve these vitamins in winter preparations. They didn't know then that not all vitamins are destroyed during processing. Jam in Russia has always been cooked and, naturally, a large number of culinary recipes have gathered. Some are even very useful, despite the fact that no one had ever heard of vitamins then. Such recipes include this one - jam from chokeberry with apples.
We lower the berries for about five minutes into boiling water, then cool them in cold water. Drain a little and put it in a jam-making dish. Pour two glasses of water into a saucepan, add 500 grams of sugar and cook the syrup. Pour the berries with the finished syrup. Bring them to a boil. Boil on low heat for three minutes and set aside for 10 hours. Apples are cleaned and cut into slices, which are boiled in water for ten minutes. Fifteen minutes before the end of cooking rowan, put the boiled apples in the jam, cover everything with the remaining sugar and cook until ready. Just before the end, add citric acid and vanilla sugar or cinnamon/