Black bean burgers with nut allergy?

https://www.seriouseats.com/the-best-black-bean-burger-recipe

I love Kenji’s recipe and have made this a zillion times. I love it, it’s absolutely perfect.

I want to make it for my vegetarian friend, but her son has a very severe nut allergy. Any ideas what could replace the cashews? Or just leave it out altogether?

Thanks!