I've had a really hard time moving my children over to primal foods. Primarily because I'm gone a lot and my wife hasn't made the effort to change them A couple of ideas I've found that they really like:
Grass fed meatballs: 1 lb grass fed beef, 2 eggs, coconut flour, seal salt and pepper. Sorry, I don't measure the flour, salt or pepper so no exact amounts. Just use enough to get the right consistency.
Bun-free burgers: they wont eat a plain grass fed patty on its own, but when I put blue cheese crumbles or grass fed cheddar and uncured bacon on top it's a hit.
Coconut milk smoothies: 1/2 can Thai coconut milk, about 1/2 cup frozen mixed berries, 1 scoop whey protein. Whey protein not my favorite thing in the world but if it gets my kids some protein I'll use it all day. A small smoothie packs a ton of great fat!
If you have other ideas attach them here, let's trade ideas!