If the skins do not come off easily, blanch the plums in boiling water for a few seconds, then transfer them to a colander. Do not pile too many plums on top of each other, as the ones underneath may become bruised or crushed. I used several colanders.

Once the plums have cooled slightly, the skins should come off easily.

After peeling, place the plums in colanders or on trays to dry. A raised mesh tray is ideal because it allows air to circulate around the plums from both sides and lets any juice drain away instead of collecting underneath them.

Place the trays in direct sunlight and allow the plums to dry. I turned the plums over once a day because they released some juice.

The drying time depends on how strong the sunlight is in your area. I don't dry my plums until they become completely hard; I prefer to leave them slightly soft and pliable. Mine took about two days to dry.