There were two main objectives of the paper: to determine the effect of pre-treatment and heat treatment of carrots and beetroots on their sensory quality, on the content of carotenoids in them, as well as on their contamination with nitrates(III) and nitrates(V), cadmium and lead; to suggest a suitable treatment method ensuring optimal quality of dishes from the products treated. It was stated that the best method of cooking carrots involved starting the cooking in a pot with boiling water. By making so, the carrots cooked showed a good sensory quality; changes in the carotenoids were the lowest; and, at the same time, the amount of chemical contaminants: nitrates(III) and nitrates(V), as well as of cadmium and lead essentially decreased. With regard to the chemical contaminants accumulation in carrots, in particular in those grown in polluted areas, it was also found that a combination of heat treatment and soaking process preceding the cooking enhanced the leaching out process of contaminants from this vegetable. It was also stated that when carrots were soaked longer than 2 hrs, their sensory quality was reduced, and, probably, losses in the content of their beneficial nutritious components happened. It is recommended to cook non-peeled beetroots, although, effects of the leaching out process of nitrates(III) and nitrates(V) are reduced; on the other hand, the sensory quality of the product being cooked is suitable. The best results of removing contaminants were obtained when grated beetroots were cooked, but their sensory quality was not satisfactory.