This is an interesting question for me as well, since I'm going through it at the moment myself. Part of the problem is that I've always been adamant that I am not a short-order cook, I will only make *one* dinner for everyone, and they can eat it or not eat it. Now...I'm eating something different. So what I'm trying to do is make slightly larger dinners, lighter on the meat, heavier on the veggies and sides.
The other night was spaghetti and meatballs (DS's birthday request). My children asked me about the "beanballs" I made (in addition to the meatballs), but no one asked to try any. (Even my DS, who loves bean burritos to pieces, didn't want one.)
I am hoping that they will gradually get interested in new things watching me.