Peel the apples, remove the core and dice. In a small saucepan melt the sugar adding a spoonful of lemon juice, a tablespoon of cinnamon and a tablespoon of jam, add the pieces of apple and cook for several minutes.
Cut the first roll of pastry in four parts; place a spoonful of apple mixture on one of the parts. With a brush moisten the edges of the pastry with the liquid from the apples. Fold the pasta over and seal the edges. Make four or five incisions with a knife and brush the surface with the liquid from the apples. Repeat with the rest of the ingredients.
Bake the buns in a pre-heated oven at 170-180°C for about 20 min. Let cool, sprinkle with powdered sugar and serve with a nice glass of apple juice!