the toothpick comes out clean, it is ready. if it has batter on it, then further baking time will be required.
wash the plums and cut them in half. remove the pits and place the plum halves into the pot. add water and let them simmer on low heat. cover with a lid and allow to soften until the peels come off easily. when ready, remove from heat and let them cool. then carefully peel them.
put the fruit flesh in a blender. add the juice that has remained in the pot. beat with a hand mixer until they become a pulp, not much though, you don’t want it to be too 