In a pan, place the condensed milk, the margarine and more than half of the box of cream, reserving a little of the cream to mix with the cream after it has cooled.

Mix everything very well and take it to the fire, always stirring until it becomes a thick cream.

Once the cream is thick, remove from heat.

Place in a container and cover with plastic to avoid creating a thick film.

Wait to cool, after cold, put the rest of the cream to make the cream softer, so it will be better to fill a cake.