I usually have the same lunch every day!
4 ryvita crackerbread (orange box) for 2pp, 1 extra light laughing cow spread over them 0pp, walkers light crisps or mighty lights 3pp a pack or french fries for 2pp a pack, some thinly sliced ham 1pp and a slice of bread for either 1 or 2pp with marmite on 0pp for 1 tsp. That usually fills me up! 6 to 7pp total which is good considering some packets of crisps alone can be that much, and I once had a supposedly low fat sandwich from boots that was 11pp!