AC,
We have offered our kids one escape if they really don’t like the food: muesly with yoghurt.
Our approach is that we don’t buy these pre-prepared foods, but buy loads of vegetables. The trick which works well with our kids is to start providing them the cucumbers, carrots, paprikas before dinner. So when they are still playing minecraft / watching peppa pig etc … they already get their most essential food. Then, during dinner we don’t have to worry that much about what they eat.
What also worked well, is that we involved our kids in preparing the food. We made together a family recepe for tomato soup and they love to prepare it themselves - and they eat well since the prepared it.
Kids eating all kinds of fish, vegetables, creme fraiche, shrimps, making their own soup / fries / mayonnaise it is all well possible.
If I would summarize it, I would suggest to bring FUN in preparing food and the rest is history.