How can you improve the nutritional content of a child's food until they are ready to eat the broccoli of their own free will? Hide some un-bitter veggies in foods they already like! Blend steamed carrots and add them to marinara sauce. Add baby kale or baby spinach to fruit smoothies (the younger versions of these plants have few bitter chemicals and go unnoticed). Push steamed cauliflower through a ricer for faux mashed potatoes. Finely shred zucchini and add it to casseroles. Blend baked sweet potato with applesauce. Add unsweetened canned pumpkin puree to pizza or pasta sauces. By adding veggies to a child's regular intake you are improving their nutritional intake and gently broadening their palate so they may be more likely to eat these foods on their own.
(PMID 26000268)