Reading what u wrote about pirashki took me back to my school days in iran.. there was a shirini forooshi called ‘Sahar’ in Tajrish – Tehran, Sahar is now huge with other branches every where. But back in the days where they had just started up they used to make these awesome pirashkis that my dad or grandad used get for us after school. They were so yuum and exactly as u just described it. God I soo miss it now :p The custard wasnt the same custard you get in the west though, it was nicer, creamier and tastier.
I will definitely post you the recipe if I find it. I will ask my mum

Mehrnaz
(Sydney-Australia)

Have a blessed day!