You did a great job getting him over the hump of eating. Now he has a real opinion, and you do have to respect it a bit.
However, you don't want his health to suffer, so I think that you should use several means of getting through this.
Jerry Seinfeld's wife wrote a book about making food that kids like to eat by putting veggies in the foods that the kids didn't know about. Many people think that this shouldn't have to be done, but I think it's okay as a gap between when they are little and when they are older. Take a look at that and see if you can use those recipes.
It is perfectly fine to withhold something if he is not willing to eat a few bites of a food. You can say to him "Well, you don't have to eat the green beans, but if you don't, there are no strawberries for you at the end of the meal. Say it once and don't show the strawberries at the table. It is then HIS choice whether to eat two bites of green beans, or give up having strrawberries. NEVER give in and give to him what you have said he cannot have if you tell him this, though.
I would not expect him to eat sauces and condiments, mom. Most kids don't. As far as lettuce goes, try making a really cool salad. Put things he likes in it. Grapes, nuts, whatever. Put it on YOUR plate. If he says he wants something that's in it, tell him fine, but he has to eat the lettuce too, or he can't have it. In other words, he is not allowed to pick the good stuff out. My own son wouldn't eat salad unless it was on MY plate. Then he would want to pick at my salad. I used reverse psychology on him and acted like I didn't want him eating MY food. He loves salad as a teenager now...
You can also get a bit sneaky and only cook green pasta for a couple of months. Of course, it tastes no different from the other pasta. But he will finally want to eat pasta and when he does taste it, he will "get" that green doesn't mean bad. There are "wagon wheel" pastas that are multi-colored. I'd try that too.
If you start making more dishes that have all kinds of color in them, he will eventually eat them. You have a lot of time, too. And lots of kids finally get more refined palates when they are older - like mushrooms, that kind of thing.
Good luck!