How to enable mTLS within mesh in AWS EKS?

Hey, I am new to this community as I just started learning istio.

We have an EKS cluster, so I followed this article and was able to configure TLS for ingress gateway.

This setup terminates TLS at gateway, but I also want to enable mTLS within mesh for securing service-service communication.

Can someone please share more details on this?

it should be pretty straightforward with peerauthentication