I haven't read through the whole thread yet, but I just had to comment on this one. I apologize in advance for it being so long... it's a touchy subject for me and apparently I have a lot to say!
I am curious at how many kids who grew up to be "well done steak with the sauce on the side" picky adults were forced to eat stuff they didn't like when they were children.
ME! That describes me to a T. I am (and have always been) a
very picky eater. Everyone said I'd grow out of it, but I didn't. I wish I wasn't so picky, it can make social situations tricky and a tad embarrassing.
My mother used to force me to eat foods I didn't like. I still have a lot of resentment towards her for that. She would try to sneak ingredients into my food, lie to me about what was on my plate, bribe or punish me for not eating what she wanted me to. I would sit at the table alone until the rest of the family went to bed, only allowed to get up to go to the restroom and serve dessert to the rest of the family (none for me of course), all because I couldn't stand to eat a carrot. None of my mother's tactics worked. I clearly remember her physically force-feeding me chicken ravioli when I was about 13 - she held me in a headlock and shoved the food down my throat, and kept shoving it back down as I was gagging it back up. Yeah that worked like a charm, chicken ravioli is now my favorite food -- NOT.
The list of foods I will eat is much smaller than the list of foods I won't eat. I don't really enjoy eating anything. But there is no way I'm going to put something I really don't like into my mouth - it will make me gag and vomit. However, I will always find something I'll eat wherever I go, or I will modify what I have to make it more tolerable. I have never expected anyone to change their menu just because I'm picky. It's my issue and I don't expect or want any other person to have to deal with it.
I read a very interesting article a while ago about "supertasters" - some people have hundreds more taste buds than others and are super sensitive to flavors, making them more picky. I believe that I fall into that category. The only way I will try new foods is if I know exactly what is in it. If there is an ingredient that I don't like, I can taste it even in trace amounts and it can make me physically ill.
Of my two girls, one is a picky eater (she likes nearly the exact opposite of everything I like) and one is much more adventurous. Sometimes I think the good eater does it just so she can boast that she's better at something than her sister!

She loves tasting new foods. She doesn't always like them and that's ok.
The other one... well she is becoming pickier as she gets older. That's ok too. She gets enough nutrition and is healthy. I provide healthy options that I know she likes, and if I limit her snacking between meals she is much more likely to eat better and occasionally even try new things. Usually if I don't even offer her something new and just enjoy it myself, she will get curious and ask to taste it; if I put the same thing on her plate or "make" her try it, she will balk at it. I've also found as she gets older (she is 10) that she will try new foods when she is with her friends.
I hope she expands her palate because I don't want her to turn out like me (being picky is a PITA!), but I won't force her to eat things she doesn't like. If she doesn't like what is being served, I have been teaching her how to prepare her own alternatives. She knows how to politely decline food in public/social situations, or to just eat what she does like. It isn't a big deal.
After the way my mother treated every mealtime as a battle, I never force the issue with my kids and they are turning out fine. The only thing the OP here is going to accomplish with her tactics is causing a rift between herself and the child, and possibly the child's mother.
(By the way, about the post I quoted: I used to not eat steak at all. Now I will eat it, but only well done and with sauce on the side.

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