He's just had a hot roast beef sandwich with me. My nephew is a nightmare and will only eat sausage (cheap ones) chips and chicken nuggets, he's 13 and now has to take supplements for his health. Mothers a social worker but has always (as has my brother) let him eat what he wants and pandered to him.
No tips ours will try anything and don't say urghh before trying it, nothing we've actively done, just lucky I guess.