^I'll gladly give what advice I can about picky kids (and their parents). There are two boys I watch over as a favor to their father here and there. The younger is slightly picky but open-minded (if he sees me eating something he hasn't had, he'll ask for a bite); the older will eat nothing but white rice, cheese, some beans, wheat tacos, occasionally ground beef, Kraft Dinner, and instant mashed potatoes. That, or McDonald's. My attitude is "you get what you get and you don't get upset" and I'm working to educate them on how their diet needs to be modified... the parents are getting fed up with the pickiness. I plan to replicate some of their favorites with better ingredients; we're all going to the yuppie grocery store later this week, where they will learn to select the best ingredients and hopefully sample some things they like. In your case, a_c, perhaps the mom can put together all of the ingredients for her chosen recipe and give you instructions. If the kidlet is old enough, then perhaps he can participate in preparing a little bit? That is a rather restrictive diet.
Addictivepersona has made some EXCELLENT posts - nice job

I'll only add that not everyone loves quinoa. I will eat it, but I feel it tastes like birdseed. I had some over the winter with lentils and a whole bunch of Middle Eastern spices - it was delicious that time. That's a recipe I need to procure!
My newest recipe is a hybrid of a few different vegetarian lasagna recipes. I avoided tomatoes (to which I am allergic if they are raw - no paranoia, I really am) and wanted to make some summer-y comfort food with what's in season. I took a couple cheats in that I had some prepared pesto on hand and I used a little bit of prepared alfredo sauce that I had left over from another meal. Also, I am now officially a believer in the noodles here, which are preboiled:
http://www.barillaus.com/Products/13/lasagne-oven-ready.aspx
This is all approximate and easily modified. I was feeling creative and since this was a winner, I wanted to share it w/the fellow foodies.
VEGETARIAN HYBRID LASAGNA
Ingredients:
- Alfredo Sauce (if anyone has an awesome recipe for it, that would be a GREAT share - I'm finding it tricky but I managed)
- 16 oz ricotta cheese
- 1 egg (it binds the whole thing together)
- Shredded mozzarella (you can really get creative with this as you layer the lasagna - I believe it was around 8 oz)
- Barilla pre-cooked lasagna noodles
- Fresh or frozen spinach (I used 10 oz. frozen organic spinach)
- Pesto (to your taste)
- Walla Walla or other sweet onion, diced
- 3 zucchini of reasonable size, sliced thinly but with texture
- 2 carrots (see above)
- Fresh garlic (to your taste)
- Garlic powder (to your taste)
- Salt and pepper (to your taste)
Procedure:
1. Prepare your alfredo sauce if you are not using canned or frozen (which you can, and yeah, I need a good technique or a hand blender).
2. Spray your lasagna pan with olive oil cooking spray (it will stick otherwise, big time).
3. Cook all of the above veggies aside from spinach on the stove or oven-roast them. I pan-fried mine in light olive oil, and they had the same texture as if roasted.
4. While that's cooking, combine your spinach with the ricotta, the egg, and pesto in a separate mixing bowl. Add your garlic powder to this mixture if you'd like.
5. Spread the bottom of the pan with a thin layer of sauce.
6. Layer lasagna noodles to fit the pan (they do expand).
7. Spread the lasagna noodles with the ricotta-spinach mixture.
8. Add 1/2 of your other veggies.
9. Add mozzarella to cover it all.
10. Repeat steps 5-9 until your pan is full.
11. Add a final layer of Italian cheese of your choice, but this should include mozzarella as it melts so nicely.
12. Place in a 375 degree oven covered in foil for 40-50 minutes.
13. Remove the foil from the lasagna when it looks cooked-through and let the top brown at a higher heat. I went with 425.
14. Once the top is browned, remove and let sit for at least 15 minutes.
15. Cut with a serrated knife and enjoy!
Here's a (work-safe) photo of the end result:
It was delicious. What little was left of the leftovers was frozen in little packets and enjoyed later.
Modifications and suggestions are welcomed.

I believe this could be made vegan with the use of faux-alfredo sauce, noodles without egg, and vegan shredded cheese, but I haven't tried that yet.