Normal sandwich fillings like cheese, ham, tuna mayo, egg mayo. Sandwiches when I was a kid were Marmite, jam or peanut butter.
Fresh vegetables, and a variety of vegetables in a meal. My mother used frozen carrots/peas, full stop. The first time she ate a meal I had made as an adult she said "ooh, it's like eating jewellery!". It was couscous with chopped up veg stirred through it.
Having serving dishes on the table for people to serve themselves potatoes etc. The norm when I was a kid was the parent "putting the dinner out" in the kitchen.
Plastic lunch boxes with characters on them, and roughneck flasks, and sandwiches in little plastic bags inside. I really wanted these but had a breadbag with a sarnie and a banana in it.