We do a rotation of various things but I always include:
raw vegetables- two from the following:
cucumber, peppers, carrot sticks, lettuce, edamame beans. I found mini peppers and cucumbers which my son loves.
fruit- a portion or two.
That way I’ve made sure he’s had 2-3 of the 5 a day at lunch!
Then:
either half a large pitta, bagel or whole meal sandwich with either:
cheese
ham
cream cheese and cucumber
marmite
sliced cold roast chicken
OR: leftovers from dinner or cold
salad.
OR: rice cakes or crackers with butter and cheese or marmite.
Then a small extra so could be:
hard boiled egg
cooked chicken
small amount of crisps or mini cheddars decanted into a smaller pot
fruit yo yo
plus sometimes a small sweet thing, usually a plain biscuit, homemade small cookie or a mini plain chocolate bar like a Freddo.
So basically each day:
Always fruit and veg. A carb based thing either a sandwich, bagel, pitta, rice cakes or crackers with appropriate filling/toping OR a salad OR leftover dinner. Plus a small extra from list above based on what else is in lunch. Plus a small sweet treat although not every day.