Well, this fruit is unusual if you don't live in the Philippines, or for that matter Mexico, or other parts of Central America where they originated. It's unusual though that it's totally unknown in Malaysia and nearby Indonesia.
Sineguelas or sigwelas as they call it in Mindanao is known as Jocote in Spanish and Spanish Plum in English and has the botanical name Spondias purpurea belonging to the Anarcardiaceae family of plants. It originated from Central and South America and was introduced to the Philippines by the Spaniards centuries ago. I was told that it is usually propagated vegetatively by cuttings or marcotting as the seeds do not germinate. In the fruiting season the leaves drop off leaving bunches or panicles of ripening fruits on the bare branches. It must be a sight to behold, though, alas I have never seen it. All I saw this season were a few remaining fruits among the thick new leaves. (See my photo below)