Prepare applesauce. Bake the cut apples in the oven for 20-30 minutes. Peel the finished apples, mash them, add granulated sugar and vanilla, and mix. Let the mixture cool for about 1 hour.
Prepare agar-agar. Pour water into a saucepan, add lemon juice, agar-agar, stir and leave for 1 hour.
Prepare the syrup. After an hour, place the pan with agar-agar on the fire, bring it almost to a boil, turn off the fire. Add the sugar prepared for the syrup, stir constantly until the sugar dissolves. Let it cool.
Combine the bases. Beat the applesauce with a mixer, add the egg white. Pour the cooled syrup in a thin stream, do not stop beating. Beat until a white fluffy mass, it should increase in size by 2 times.
Make marshmallows. Form marshmallows with a spoon or pastry bag. Leave for 24 hours to dry.