yellow plum

My friend had a yellow plum tree.He said the plums were delicious. 

When I saw these plums in the shop, I bought a couple. It was sour and disappointing. I had a sauce of chilli, salt, sugar and fish sauce. the way I always ate sour fruits with my siblings.

My husband ate another, and he said it was sweet.

A friend asked if it is a Mirabelle plum, I wish I knew.