Sometimes it’s not an ingredient that children aren’t a fan of but the way in which it is prepared.
My son, for example, has a preference for raw vegetables whilst my daughter prefers them cooked. My son prefers his carrots cut into sticks and my daughter circles – we can find a common ground with raw and grated!
Neither of them are a fan of apples left whole but quarter them and my son is happy, cut into thinner slices and that’s my daughter sorted.
Try preparing foods in different ways to find your child’s preferences and you may well start to see them eating more and more of the ingredients you thought they wouldn’t touch.