Not quoting people as I don't want to single people out, and its a very common idea anyway but...
Please, do NOT take it upon yourself to offer, bribe, tempt kids into eating new/other foods. You may feel like this would work and be helpful, but it almost always ISN'T unless done in a very very careful manner.
So a parent simply making another food available on the table, with zero expectation that the child try it at all, no comment about it, no 'go on have a bite' etc etc - that may work, particularly if others are eating it without comment.
All the other things people do:
'GO on, just one bite then you can have xyz'
'How do you know you don't like it, you haven't tried it?'
'Go on just give it a go, you might like it'.
And of course if you DO try something, or attempt to, theres more pressure.
Even if by miracle of miracles, you try something and its actually ok, theres still more damage done by the 'SEE you DO like it... ' ie. 'weren't you being silly, I know your body/brain better than you do and I am even less likely to listen to you in future'.
If it isn't your kid - back the fuck off.
If it is your kid - be very careful!
When I try new foods, I prefer to do so in private, I need to push/poke it around, touch it with my fingers, perhaps lick it, do a tiny nibble... and I have to feel safe to spit it out if I don't like it. This is not something most people want to watch nor is it something people want to be watched doing.
Fortunately as an adult I have the freedom to do as I please and my partner says absolutely nothing about it at all and as a result I do generally feel better about trying things and in the past have expanded the range of foods I can eat very well... (I really don't know whats caused this latest massive regression but I think over analysing it probably won't help me!), but any sort of pressure would set me right back.