Mother-in-Law's Eye

Wash the plums, remove the pits, and let them cook slowly with a few drops of water in a covered pan

Do not cook; let them soften slightly

Wait for it to cool and fill with the following: bring the sugar and water to a boil and let it cook until it reaches the thread stage (this is when you can drop a little of the mixture from a spoon, and it should form a thread)

Let it cool

Add the egg yolks and reheat again

Stir constantly until the mixture detaches from the sides of the pan

Let it cool, and then fill the plum cavities

Also pass through crystallized sugar if desired.