Sorry if I’m misunderstanding your post, but cashews are drupes, not nuts. I don’t know whether all true nuts come from trees, but all the ones I can think of do.
I don’t see why the apple from a cashew can’t also be classified as an aggregate accessory fruit, like the red flesh of the strawberry, which would make the cashew pit an achene like the seeds of a strawberry.
Sorry if I’m misunderstanding your post, but cashews are drupes, not nuts. I don’t know whether all true nuts come from trees, but all the ones I can think of do.
If strawberries are nuts, cashews are nuts. It’s a seed that grows on the outside of an accessory fruit.
Obviously strawberries aren’t nuts either but we’re playing pretty fast and loose with words and meanings.
The “nut” from a cashew is the seed a stone fruit (like the center of a peach pit). The strawberry “seed” is the entire fruit.
I don’t see why the apple from a cashew can’t also be classified as an aggregate accessory fruit, like the red flesh of the strawberry, which would make the cashew pit an achene like the seeds of a strawberry.