¿Pistachee?
There is a row of beautiful trees lining Avenida Mexico in front of Parque Hidalgo here in Puerto Vallarta. I walk by these trees several times each week and right now they are heavy with a fruit I mistook for olives.
I asked an old man sitting in the park what kind of tree this was—“¿Qué tipo de árbol es este?”
“Arrayan,” he replied.
I thought he was wrong. So I took a couple of pictures and pulled down a high branch to examine the fruit.