My feeling is that you will never be able to force a LO to eat. And bribing/cajoling/standing on your head just really creates stress. At that age, dd ate what we were having. 3 or 4 things on her plate. Most every night there were 2 or 3 of the 4 that I knew she'd eat. I have heard some people say "Serve one thing you KNOW she'll eat, one thing she MIGHT eat, plus one new thing." For me, I tended to serve dinners she enjoyed, introducing new foods a few times a week, but not always at dinner.
If I roasted red pepper and she didn't like it, I'd try raw red pepper with dip another day. A child will never eat what they won't touch...so do encourage her to touch, smell, lick, whatever. Some kids need lots and lots of exposure to something new before they will eat it. My dd never ate raw carrot until I shredded it and it looked like match sticks. Go figure. I used to chop up broccoli tops sooooo tiny and mix them with scrambled eggs or pastina. Salad is a good way to expose a child to veggies without feeling like you're preparing a whole other meal. DD always liked a dish of dressing to "dip" her salad into....that always enticed her.
Also....look at what she DOES eat and try to expand along similar lines. If she likes baked potato, try sweet potato, kwim? Same kind of texture.
So....I wouldn't force....(you can't anyway....how far does that go, yk?). I would eat my dinner with her, chit chat about the day, and not make a big fuss over the food. I may be in the minority, but I don't make "deals" with food, or insist on anything. It is important to me that dd be in control of her food, and that mealtimes be stress free. I'd save new foods for snacks or lunch if it were me, just to try and change things up and eliminate any stress at dinner.
At her age, I would just focus on exposure....different ways of presenting things. Look at what she eats in a week, rather than in a day, yk?