What is this? It appears to have a nut inside. The tree which bore it was around 5m high and was covered in this fruit in late August

2 answers
CariI have some in my neighborhood.
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That's got to be a Turkish Hazel (a.k.a. "Corylus colurna")

You can eat them. Here's a bunch of pictures to compare:

https://en.m.wikipedia.org/wiki/Corylus_colurna.
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The question asker
Thank you
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Eric W2215 helpful answers
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Where in the world are you located, that might help identify this as well.
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The question asker
United Kingdom