Raw sunflower seeds would be a good option. (Not roasted) Note there are hazelnuts in the crust, so if you’re allergic to all nuts swap those as well.
There will definitely be a flavor of the sunflower seeds that is noticeable in the end result.
That's probably as good a sub as you'll find, but it should be noted that cashews are the body of the filling on this; their bland sweetness can't really be duplicated, and a substitute will be a pretty radical departure from the original.
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There will definitely be a flavor of the sunflower seeds that is noticeable in the end result.