If there are pieces of fruit or bones in the jam, then rub through a fine sieve. I have some orange jam I bought.
Mix the protein and jam in one bowl. The proteins should be well separated, and the dishes should be clean and dry. In a saucepan with a thick bottom, mix the agar, water and sugar.
At the same time, heat the syrup and whisk the whites with jam.
Bring the syrup to 110 degrees. Egg white with jam by this time should increase in volume and lighten.
Pour the syrup into the egg and jam in a thin stream. Beat at maximum speed.
Marshmallow mass should keep its shape well. If necessary, add a drop of food coloring.
Transfer to a pastry bag with a nozzle. I have 1 m. Put on parchment. Let it brew for 5-6 hours at room temperature.