Okay, to stay on the ORIGINAL topic, as for your mother adding butter to your salmon, when I was starting out vegetarian, I had to cook all my meals. Not because my mom didn't want to cook them, but I used to catch her sticking beef in my stir fry or other sneaky things. If you stand by and watch them closely, maybe she won't be as sneaky about it. Also, maybe you can get her to substitute soy margarine for butter. Maybe she thinks that it will just taste better with butter (a lot of fish eaters use butter when cooking their fish), and using a vegan replacement will help.