Help! Dinner time struggles

Need help please. For the last year dinner time with my LO is a nightmare. If it's pizza or corn on the cob it's walk in the park. Anything else pork chops, steak, chicken, or pasta he either goes to bed hungry or sits at the table for 2hrs. He either doesn't sit still like he's got ants in his pants or tears. He refuses to try new things. A friend said to try and smother the vegetables in melted cheese he ate around and picked out the cheese. I've tried incentives like ice cream or fruit after dinner. It's either both of us in tears at the end of dinner or just one of us. Any advice please