Wash and stone the yellow plums. Peel, core and cut apples into small pieces. Mix 1.5 kg prepared fruit, jam sugar and citric acid well in a large pot. Bring everything to the boil while stirring over high heat. Let it boil for 3 minutes while stirring constantly. Immediately pour the jam into the prepared jars and close them tightly. Place the glasses on the lid for approx. 5 minutes
With five glasses: