I can’t think of any particular dishes that my mom made per se, but she only knew how to cook things that took a long time. So lasagna, spaghetti with meatballs, chili… all wonderful. Steak and broccoli, on the other hand… Oof. I loved my mom, but she could not cook these things well. When I finally had a well cooked steak that didn’t eat like shoe leather it was a revelation.
My mom used to make hot potato and tuna salad. It was one of my favorites growing up. It was boiled potatoes, relish, tuna, mayo, salt and pepper, served warm. Really tasty.
Tuna casserole is another tasty option.
If you want to go an Asian route, you can do tuna served on rice with some chili crisp and sliced cucumber.