Someone in Scandinavia told me in their childhood, they search for "glass apples" in orchards. These were very occasionally underripe apples, translucent in such a way that if you held one up to the sun, you could still see (most of) the sun through it. Hence the name or phrase "glass apple". I can't find any online reference, but that's possibly as no matter how I search I get a million results consisting of glassware shaped like apples. Does such a thing, or concept, exist - and even better are there any online references to more information? Thanks.