I thought I bought these seeds, but as it turns out I somehow made a mistake and bought a different plant called Soapberry - sapindus sapinaria. It's only good for soap as I understand, not for eating.
Sometimes it takes me so long to fill an online cart that I time out, and then I have to put everything back in the cart again - probably when I went to reenter Dune Soapberry into my cart, I was in a hurry and accidentally clicked on sapindus sapinaria instead. So I planted it anyway, but I already have Ritha/Soap Nut so did not need another plant that makes soap. On the other hand, I WOULD enjoy growing a less finicky version of lychee/longan! So I will have to try again another time.
I would love to see pictures of people's progress, or hear accounts of the fruit if anyone's tried it. I know it's not likely to be quite as tasty, but that's ok with me, I like the variety.
Let this be a lesson to be extra careful when buying plants with colloquial names - especially if it has the word SOAP in it! There are a lot of different plants that go by the same or a similar name.
Oh well, at least I'll get to learn 2 different ways to make soap from a plant...