The short answer
Offer it repeatedly with no pressure and no comment, alongside something they already eat. It can take many exposures, and pressure makes it take more.
- Put a small amount on the plate alongside familiar food, with no requirement to eat it.
- Say nothing about it. No praise for trying, no disappointment for not.
- Expect to repeat it many times. Ten or more exposures is normal and not a failure.
- Let them handle and play with it, which is a real part of how young children accept food.
- Eat it yourself at the same table, visibly and without making a point of it.
What will ruin it
Do not use dessert as a reward for eating vegetables. It teaches that the vegetable is the price and the pudding is the prize, which is the opposite of what you want long term.
Why it works
Familiarity drives acceptance in children far more than taste does. Pressure creates an association between the food and the conflict, which is the thing that lasts.
This is general information, not medical advice, and it does not replace a GP, a pharmacist or NHS 111. Call 999 in an emergency. Full disclaimer.