Pistachios are healthy!
A week ago Mum & Dad gave me lovely fresh-picked pistachios from their own trees.
The rest are all eaten now but these were a little immature and not split ready to eat,
so far as I know there's no way to get them open if they've not split on their own.
The yellow blob made me think of an eye, it's still-sticky sap from the nut's soft outer shell.