My DC is a late teenager, so pre-BLW. We tended to do a main meal at lunch-time (both family and nursery) and then more casual for tea.
What worked for us was a BLW by accident. My child didnt seem to manage "sandwiches" so I offered lots of small pots of cut vegetables (pepper, cucumber, lettuce, olive, carrot sticks, avocado, cherry tomatoes, etc) with small pots of every dip you could think of. I used brightly coloured bowls, and fun divided platters. I would then add sliced sausage rolls, cheese rolls, pork pies, ham, cheese etc. Sliced apples, halved grapes, banana slices etc. Ate everything, because they could touch,feel, dip etc.
For mains - always small portions of what we were eating. I am veggie, his dad meat eater so mostly my DC would eat meat as their protein. But we (me!) always serves at least 4-6 different veggies with every main meal. Different colours and textures. My DC used a knife, fork & spoon from a young age. And we sat at a formal dining table.
15+ years on the only issue I have is that they don't like "spikey" food. (fair enough - I recently started using chilli flakes - yes they are HOT!)
So variation, child-led, flexible. But just not all sweet foods.