Wash the plums and pit them. I used nectarine and peach as well, pitting them too.
Put the fruits in a pot or a saucepan.
Turn the heat on. Add water to the fruits to avoid burning. You can close the lid. Stir them from time to time.
Add sugar or salt.
Let them cook for 1 hour until they fully soften. Take the pot off the stove.
Crush the fruits using a hand blender or a masher. In this step, the peels are broken down into small pieces and we get a fruit puree.
If the puree is watery, let it simmer on low heat until the extra water is evaporated. If it’s too watery, your fruit leather takes longer to dry and might mold.
Spread the puree on a tray.
Leave it in the oven to dry.
After the puree dries up, cut it into strips. Keep it in a sealed glass container.