Fold the marshmallow in a dish in which it will be convenient to heat it in a microwave oven or in a water bath. Pour lemon juice into the marshmallow. Distilled water or equal amount of butter can be used instead of lemon juice.
Send the marshmallows in the microwave for just half a minute.
During this time, the delicacy will first approximately double in volume, and then will begin to melt into a homogeneous mass.
Sometimes the heating procedure in the microwave has to be repeated, stirring the marshmallows with a spoon in intervals, until the desired result is obtained.
Sift the icing sugar onto the work surface through a sieve. Put melted marshmallow on top of the powder.
At this stage, you can add dye to the mastic to achieve the desired color.
It is most convenient to knead the mastic on the table with your hands, like dough.
When the mastic becomes plastic, homogeneous and soft, roll it into a ball, cover with foil and leave to lie down for 30 minutes. Then re-knead by rolling with a rolling pin and rolling back into a lump.
As a result, you should get a mass that does not stick to your hands and is similar in consistency to plasticine.