I remembered during my secondary school time, I went to my friend's place after school. My friend took out a frozen pizza base, chopped some veggies, spread some butter, sprinkled the cheese and veggies on the pasta, placed in an oven and heated it. We shared the pizza for lunch.
During my time, after my school, we would take out cooked food from the fridge and steamed them. If there was no more rice, we simply cooked them using rice cooker - I still do not know how to cook rice if I am not using rice cooker :oops: . There were frozen buns etc. We do not eat out during those days. Sometimes, mum would place hard boiled eggs or fried peanuts on the table to go with the rice. At times, canned food. I would suggest placing mixed nuts on the table too.
The kids probably won't eat lunch at home that much once they get to secondary schools. I hardly did after my primary school days. But I had full meals in the mornings before going to school.