My kid dislikes vegetables

I had to threaten him that that plate of wantan noodle would be the last he would be taking if he didn't take the 'choy sum' on his plate. After much struggle with him, he finally only agreed to take one piece and he chose to take the stem. I tried again a second time,with much persistence and firmness than the first time. Only a second piece of small stem managed to go into his digestive system. And, he had to eat it together with a big spoonful of noodle. Anyway, it is a start for him. I don't blame him as Mom didn't work hard enough to feed him those fibrous food from young.