another tree ID

[Steph-B]

Hello, I’m wondering what this striking tree is in Parc Leopold, Brussels. The fruit look like green apples on the branches, but on the ground they are rotting to reveal big stones like peaches and they smell slightly lemony. It’s shed nearly all its leaves now.

[Bogieman]

Walnut?

[5thelement]

Definitely Walnut.

[Steph-B]

I see no walnuts, just these weird apple-like fruits…

[Stubby]

14 minutes ago, Steph-B said:

I see no walnuts, just these weird apple-like fruits…

The hard shell is inside the green soft outer casing . The edible nut is , obviously inside the hard shell .  

[Steph-B]

Really? But the stones are soft and rotten like the fruit… I’ll have to go back and check them out again tomorrow. Thanks for your help 😊

[Stubby]

Just now, Steph-B said:

Really? But the stones are soft and rotten like the fruit… I’ll have to go back and check them out again tomorrow. Thanks for your help 😊

You can't stop stuff rotting if the conditions prevail ...

[daltontrees]

Definitely Walnut.

[spudulike]

Looks a bit pickled to me......agree with the above seeing as the walnuts are still on it!

[Steph-B]

I went back this morning and had a better look on the ground. You were both/all absolutely right: walnuts everywhere! But so filthy that no one realised. So I foraged a few: 

They're a bugger to crack! There's not much flesh in them either, and they taste a bit weird and sweet. But apparently you need to put them aside to "cure" for a few weeks, so that's what I'll do. Many thanks for your help 🙂