I just came across your Lemon plums in the grocery.
Not bad. Sweet juicy bubble gum flavor inside. A little sourness in the thin skin.
Considering I haven’t eaten a fresh plum in half a year, I was very glad to have them. My kid loves them.
They do look a lot like Inca and Superior plums, but are likely their own distinct cultivar. They have the EXACT same label as the ones eaten last year by @Borer_the_explorer!