[Homemade] Chicken Liver and Onions

How do you cook the livers? I've tried doing it once before, but the texture was not my favorite like mushy and grainy in the wrong ways. Is that normal or did I just not prep them right?

I want to like this and get it from a local butcher, but I'm willing to accept that liver isn't my dish. I just feel like I messed up the sourcing/freshness or preparation.