I havent heard of that one but it does sound great, only using 4 ingredients must save time.
I have experimented over years and put togethr my own recipe book that suits my family. I have listed items each person doesnt like; when I actually started to listen to them it made life easier!
It doesnt mean I dont use an ingredient, but I serve little or none in their portion. Or I have these meals when they are not around.
In hot weather we dont use the oven to keep the house temperature cooler. We also tend to cook quick meals, eg. the old Egg Combo, fish, or fritters from left over meat.
In extreme weather we don't cook. We often have sliced meat/ tin fish and salad, but a salad doesn't mean traditional, try things your family likes, eg. celery sticks, nectarines, grapes and nuts - takes no time to make. Be creative. I keep a range of dressings in the fridge so salads are not so boring too. The key is to note what people do like and add to this list as you go along. Sometimes when I see an extreme weather is coming up, I will make something a day or two in advance. BTW I don't think there is anything wrong with having takeaway when it is a stinking hot day and everyone has had it ! As long as you allow for it, don't do it all the time and try to keep portions smaller.