ha im actually i the same boat, i have twin two year old boys, so far ive found that its hard to keep them on the plan. Mine love meat and veggies but still want fruit gummis and ice cream.
All ive really found to do is to keep an empty box of junk food so you can show them that you dont have any, and try to limit how much they get.
I try and cut up an season most of there foods to where they can eat them as finger foods, they seem to eat better when they can hold it themselves
Mine seem to like ground turkey and veggies and beef jerky so I try and keep both in the fridge for quick reheating.
My secret weapon though is "french fries"
i cut mushrooms in strips, drop them in an egg wash [no dairy just beaten eggs], completley coat them in almond meal and fry in evoo