make sure your child has school dinners. that way you don't have to make a packed lunch and can give them jam sandwiches for tea (they should only have 5 portions of fruit/veg a day, right?)
at weekends, humous on crackers counts as lunch. chickpeas are a vegetable.
if you want your kids to tidy up, just announce a competition to see who can pick up most toys. waaay easier than all that positive reinforcement / timeout stuff.