I think everyone has pretty much covered everything.

Just wanted to say, have you thought of keeping a food diary? I think you might be quite surprised as to how much healthy stuff your kids actually eat.

You did mention they like sweet potato mash, carrots, lettuce potatoes, cutlets, chops, spag bog etc.. well IMO i think this is pretty good for kids their age and you do grate veggies into most things so i really don't think you have anything to worry about, sounds like they are a couple of healthy normal children

Just keep cooking meals you and dh like and the kids will eventually begin to learn to taste new things. The worse thing you can do is stress about it and make a big deal over them not trying things, cause this will prob make them less inclined to try things etc.

Your doing a great job