The carrots and beans were mashed, steamed, boiled, stir-fried, grilled and deep-fried and then served to the children, whose ages ranged from 4 years to 12 years.
A control group of 18-25 year-old adults was also served the same vegetables prepared in the same methods.
The researchers, who said that children in many countries ate fewer vegetables than the amount recommended by healthcare professionals, found that the majority of children liked the steamed or boiled vegetables the best.
They attributed this to the fact that the carrots and beans retained their original taste, colour and crunchiness, and that this way of cooking, which many children were familiar with, kept the vegetables’ surface uniform and without any brown colouring.